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==Numbering pattern==
==Numbering pattern==
A rough grid of two-digit numbers is assigned to major routes; [[U.S. Route]]s and [[Interstate Highway]]s make the grid imperfect. Odd-numbered routes stretch from [[U.S. Route 101 (Washington)|U.S. Route 101]] (functionally a State Route 1) in the west to [[State Route 31 (Washington)|State Route 31]] in the east. Even-numbered routes run in three general strips, roughly separated by [[Interstate 5]] and the [[Columbia River]]. The westernmost strip runs from [[State Route 4 (Washington)|State Route 4]] north to [[State Route 8 (Washington)|State Route 8]] (2 and 10 are used up by [[U.S. Route 2 (Washington)|U.S. Route 2]] and former [[U.S. Route 10 (Washington)|U.S. Route 10]]). The next strip runs from [[State Route 14 (Washington)|State Route 14]] (former [[State Route 12 (Washington)|State Route 12]] before [[U.S. Route 12 (Washington)|U.S. Route 12]] was extended into the state) north to [[State Route 20 (Washington)|State Route 20]], and the eastern strip runs from [[State Route 22 (Washington)|State Route 22]] to [[State Route 28 (Washington)|State Route 28]] (formerly to [[State Route 30 (Washington)|State Route 30]], now part of SR 20).
A rough grid of two-digit numbers is assigned to major routes; [[U.S. Route]]s and [[Interstate Highway]]s make the grid imperfect. Odd-numbered routes stretch from [[U.S. Route 101|U.S. Route 101]] (functionally a State Route 1) in the west to [[Washington State Route 31|State Route 31]] in the east. Even-numbered routes run in three general strips, roughly separated by [[Interstate 5]] and the [[Columbia River]]. The westernmost strip runs from [[Washington State Route 4|State Route 4]] north to [[Washington State Route 8|State Route 8]] (2 and 10 are used up by [[U.S. Route 2|U.S. Route 2]] and former [[U.S. Route 10|U.S. Route 10]]). The next strip runs from [[Washington State Route 14|State Route 14]] (former [[Washington State Route 12|State Route 12]] before [[U.S. Route 12|U.S. Route 12]] was extended into the state) north to [[Washington State Route 20|State Route 20]], and the eastern strip runs from [[Washington State Route 22|State Route 22]] to [[Washington State Route 28|State Route 28]] (formerly to [[Washington State Route 30|State Route 30]], now part of SR 20).


Less major routes are assigned three-digit numbers, as a spur of a major route. One or two digits are added onto the end of the "parent" to form the three-digit number. For instance, [[U.S. Route 101 (Washington)|U.S. Route 101]] (functionally SR 1) has spurs of [[State Route 104 (Washington)|State Route 104]] and [[State Route 117 (Washington)|State Route 117]], [[Interstate 5 (Washington)|Interstate 5]] has spurs of [[State Route 505 (Washington)|State Route 505]] and [[State Route 527 (Washington)|State Route 527]], and [[State Route 26 (Washington)|State Route 26]] has [[State Route 261 (Washington)|State Route 261]] as a spur. Spurs of [[State Route 20 (Washington)|State Route 20]] begin with 21, as 20X is used by spurs of [[U.S. Route 2 (Washington)|U.S. Route 2]]. ([[State Route 10 (Washington)|State Route 10]] has no spurs, and neither did [[State Route 30 (Washington)|State Route 30]].) Several unused two-digit numbers are assigned functionally to U.S. Routes - for instance [[U.S. Route 97 (Washington)|U.S. Route 97]] fits as SR 15, so one of its spurs is [[State Route 153 (Washington)|State Route 153]]. Similarly, a spur of [[U.S. Route 395 (Washington)|U.S. Route 395]], functionally SR 29, is [[State Route 291 (Washington)|State Route 291]]. On the other hand, both of these have newer spurs assigned based on their U.S. Route numbers - [[State Route 971 (Washington)|State Route 971]] and [[State Route 397 (Washington)|State Route 397]] for instance. This method had been used since the beginning for some spurs of [[U.S. Route 830 (Washington)|U.S. Route 830]] (since renumbered as spurs of [[State Route 4 (Washington)|State Route 4]]), though other spurs were numbered by its location in the grid (as SR 4 and SR 12).
Less major routes are assigned three-digit numbers, as a spur of a major route. One or two digits are added onto the end of the "parent" to form the three-digit number. For instance, [[U.S. Route 101|U.S. Route 101]] (functionally SR 1) has spurs of [[Washington State Route 104|State Route 104]] and [[Washington State Route 117|State Route 117]], [[Interstate 5|Interstate 5]] has spurs of [[Washington State Route 505|State Route 505]] and [[Washington State Route 527|State Route 527]], and [[Washington State Route 26|State Route 26]] has [[Washington State Route 261|State Route 261]] as a spur. Spurs of [[Washington State Route 20|State Route 20]] begin with 21, as 20X is used by spurs of [[U.S. Route 2|U.S. Route 2]]. ([[Washington State Route 10|State Route 10]] has no spurs, and neither did [[Washington State Route 30|State Route 30]].) Several unused two-digit numbers are assigned functionally to U.S. Routes - for instance [[U.S. Route 97|U.S. Route 97]] fits as SR 15, so one of its spurs is [[Washington State Route 153|State Route 153]]. Similarly, a spur of [[U.S. Route 395|U.S. Route 395]], functionally SR 29, is [[Washington State Route 291|State Route 291]]. On the other hand, both of these have newer spurs assigned based on their U.S. Route numbers - [[Washington State Route 971|State Route 971]] and [[Washington State Route 397|State Route 397]] for instance. This method had been used since the beginning for some spurs of [[U.S. Route 830|U.S. Route 830]] (since renumbered as spurs of [[Washington State Route 4|State Route 4]]), though other spurs were numbered by its location in the grid (as SR 4 and SR 12).


The two spurs of [[State Route 9 (Washington)|State Route 9]] are [[State Route 92 (Washington)|State Route 92]] and [[State Route 96 (Washington)|State Route 96]], as three-digit numbers beginning with 90 are in use by [[Interstate 90 (Washington)|Interstate 90]].
The two spurs of [[Washington State Route 9|State Route 9]] are [[Washington State Route 92|State Route 92]] and [[Washington State Route 96|State Route 96]], as three-digit numbers beginning with 90 are in use by [[Interstate 90|Interstate 90]].


==History==
==History==
The first state road, running across the [[Cascade Range]] roughly where [[State Route 20 (Washington)|State Route 20]] now crosses it, was designated by the legislature in 1893. Two other roads - a Cascade crossing at present [[State Route 410 (California)|State Route 410]] and a branch of the first road to [[Wenatchee (WA)|Wenatchee]] - were added in 1897. The [[Washington Highway Department]] was established in 1905, and a set of twelve ''State Roads'', numbered from 1 to 12, were assigned. A thirteenth was added in 1907, and SR 14 to SR 18 in 1909.<ref name="1893-1935">[http://www.wsdot.wa.gov/research/History/stateroads1893-1935.pdf State Roads As Established by Legislature, 1893 to 1935] ([[PDF]])</ref><ref name="40 years">[http://www.wsdot.wa.gov/research/History/40years.htm Historical Collection - 40 Years with the Washington Department of Highways]</ref>
The first state road, running across the [[Cascade Range]] roughly where [[Washington State Route 20|State Route 20]] now crosses it, was designated by the legislature in 1893. Two other roads - a Cascade crossing at present [[Washington State Route 410 (California)|State Route 410]] and a branch of the first road to [[Wenatchee (WA)|Wenatchee]] - were added in 1897. The [[Washington Highway Department]] was established in 1905, and a set of twelve ''State Roads'', numbered from 1 to 12, were assigned. A thirteenth was added in 1907, and SR 14 to SR 18 in 1909.<ref name="1893-1935">[http://www.wsdot.wa.gov/research/History/stateroads1893-1935.pdf State Roads As Established by Legislature, 1893 to 1935] ([[PDF]])</ref><ref name="40 years">[http://www.wsdot.wa.gov/research/History/40years.htm Historical Collection - 40 Years with the Washington Department of Highways]</ref>


However, it was not until 1913 that a connected system was laid out - earlier state roads had been disconnected segments of road needing improvements. The seven ''primary roads'' were only assigned names, while the older state roads kept their numbers as ''secondary roads''. In 1923, most state roads were assigned new numbers, though the primary and secondary split remained, and several roads remained named only.<ref name="40 years"/> The [[United States Numbered Highways]] were assigned in late 1926, overlapping some of the State Roads.
However, it was not until 1913 that a connected system was laid out - earlier state roads had been disconnected segments of road needing improvements. The seven ''primary roads'' were only assigned names, while the older state roads kept their numbers as ''secondary roads''. In 1923, most state roads were assigned new numbers, though the primary and secondary split remained, and several roads remained named only.<ref name="40 years"/> The [[United States Numbered Highways]] were assigned in late 1926, overlapping some of the State Roads.


The first major reworking of the system was passed in 1937, including a complete renumbering. A number of ''Primary State Highways'' were designated, while ''Secondary State Highways'' were suffixed spurs off of those. For instance, [[Primary State Highway 1 (Washington)|Primary State Highway 1]] was the [[Pacific Highway (Washington)|Pacific Highway]] (present [[Interstate 5 (Washington)|Interstate 5]]), and [[Secondary State Highway 1B (Washington)|Secondary State Highway 1B]] was a spur from [[Bellingham (WA)|Bellingham]] to the [[Canadian border (US)|Canadian border]] (now [[State Route 539 (Washington)|State Route 539]]). U.S. Routes kept dual designations with State Highways.<ref name="40 years"/> By 1952, the present highway shield, in the shape of [[George Washington]]'s head, had been adopted.<ref>Twenty-Fourth Biennial Report of the Washington Highway Commission 1950-52, [http://www.wsdot.wa.gov/Hq/Library/ImageLibrary/1950-52/1950-52%20image25.htm U. S. Route directional marking assembly supplemented by overhead mast arm supported standard destination signs in Tenino, Washington.]</ref>
The first major reworking of the system was passed in 1937, including a complete renumbering. A number of ''Primary State Highways'' were designated, while ''Secondary State Highways'' were suffixed spurs off of those. For instance, [[Primary State Highway 1|Primary State Highway 1]] was the [[Pacific Highway|Pacific Highway]] (present [[Interstate 5|Interstate 5]]), and [[Secondary State Highway 1B|Secondary State Highway 1B]] was a spur from [[Bellingham (WA)|Bellingham]] to the [[Canadian border (US)|Canadian border]] (now [[Washington State Route 539|State Route 539]]). U.S. Routes kept dual designations with State Highways.<ref name="40 years"/> By 1952, the present highway shield, in the shape of [[George Washington]]'s head, had been adopted.<ref>Twenty-Fourth Biennial Report of the Washington Highway Commission 1950-52, [http://www.wsdot.wa.gov/Hq/Library/ImageLibrary/1950-52/1950-52%20image25.htm U. S. Route directional marking assembly supplemented by overhead mast arm supported standard destination signs in Tenino, Washington.]</ref>


{{main|1964 state highway renumbering (Washington)}}
{{main|1964 state highway renumbering (Washington)}}
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!width=25%|Former or proposed State Routes
!width=25%|Former or proposed State Routes
|-
|-
!colspan=2|[[U.S. Route 101 (Washington)|U.S. Route 101]] (functionally SR 1)
!colspan=2|[[U.S. Route 101|U.S. Route 101]] (functionally SR 1)
|-
|-
|[[State Route 100 (Washington)|SR 100]] ([[State Route 100 Spur (Washington)|Spur]]); [[State Route 102 (Washington)|SR 102]]; [[State Route 103 (Washington)|SR 103]]; [[State Route 104 (Washington)|SR 104]]; [[State Route 105 (Washington)|SR 105]] ([[State Route 105 Spur (Washington)|Spur]]); [[State Route 106 (Washington)|SR 106]]; [[State Route 107 (Washington)|SR 107]]; [[State Route 108 (Washington)|SR 108]]; [[State Route 109 (Washington)|SR 109]] ([[State Route 109 Spur (Washington)|Spur]]); [[State Route 110 (Washington)|SR 110]] ([[State Route 110 Spur (Washington)|Spur]]); [[State Route 112 (Washington)|SR 112]]; [[State Route 113 (Washington)|SR 113]]; [[State Route 115 (Washington)|SR 115]]; [[State Route 116 (Washington)|SR 116]]; [[State Route 117 (Washington)|SR 117]]; [[State Route 119 (Washington)|SR 119]]
|[[Washington State Route 100|SR 100]] ([[Washington State Route 100 Spur|Spur]]); [[Washington State Route 102|SR 102]]; [[Washington State Route 103|SR 103]]; [[Washington State Route 104|SR 104]]; [[Washington State Route 105|SR 105]] ([[Washington State Route 105 Spur|Spur]]); [[Washington State Route 106|SR 106]]; [[Washington State Route 107|SR 107]]; [[Washington State Route 108|SR 108]]; [[Washington State Route 109|SR 109]] ([[Washington State Route 109 Spur|Spur]]); [[Washington State Route 110|SR 110]] ([[Washington State Route 110 Spur|Spur]]); [[Washington State Route 112|SR 112]]; [[Washington State Route 113|SR 113]]; [[Washington State Route 115|SR 115]]; [[Washington State Route 116|SR 116]]; [[Washington State Route 117|SR 117]]; [[Washington State Route 119|SR 119]]
|[[U.S. Route 101 Alternate (Washington)|US 101 Alternate]]; [[State Route 111 (Washington)|SR 111]]; [[State Route 118 (Washington)|SR 118]]
|[[U.S. Route 101 Alternate|US 101 Alternate]]; [[Washington State Route 111|SR 111]]; [[Washington State Route 118|SR 118]]
|-
|-
!colspan=2|[[U.S. Route 2 (Washington)|U.S. Route 2]]
!colspan=2|[[U.S. Route 2|U.S. Route 2]]
|-
|-
|[[State Route 202 (Washington)|SR 202]]; [[State Route 203 (Washington)|SR 203]]; [[State Route 204 (Washington)|SR 204]]; [[State Route 206 (Washington)|SR 206]]; [[State Route 207 (Washington)|SR 207]]
|[[Washington State Route 202|SR 202]]; [[Washington State Route 203|SR 203]]; [[Washington State Route 204|SR 204]]; [[Washington State Route 206|SR 206]]; [[Washington State Route 207|SR 207]]
|[[State Route 200 (Washington)|SR 200]]; [[State Route 209 (Washington)|SR 209]]
|[[Washington State Route 200|SR 200]]; [[Washington State Route 209|SR 209]]
|-
|-
!colspan=2|[[State Route 3 (Washington)|State Route 3]]
!colspan=2|[[Washington State Route 3|State Route 3]]
|-
|-
|[[State Route 300 (Washington)|SR 300]]; [[State Route 302 (Washington)|SR 302]] ([[State Route 302 Spur (Washington)|Spur]]); [[State Route 303 (Washington)|SR 303]]; [[State Route 304 (Washington)|SR 304]]; [[State Route 305 (Washington)|SR 305]]; [[State Route 307 (Washington)|SR 307]]; [[State Route 308 (Washington)|SR 308]]; [[State Route 310 (Washington)|SR 310]]; [[State Route 339 (Washington)|SR 339]]
|[[Washington State Route 300|SR 300]]; [[Washington State Route 302|SR 302]] ([[Washington State Route 302 Spur|Spur]]); [[Washington State Route 303|SR 303]]; [[Washington State Route 304|SR 304]]; [[Washington State Route 305|SR 305]]; [[Washington State Route 307|SR 307]]; [[Washington State Route 308|SR 308]]; [[Washington State Route 310|SR 310]]; [[Washington State Route 339|SR 339]]
|[[State Route 306 (Washington)|SR 306]]
|[[Washington State Route 306|SR 306]]
|-
|-
!colspan=2|[[State Route 4 (Washington)|State Route 4]]
!colspan=2|[[Washington State Route 4|State Route 4]]
|-
|-
|[[State Route 401 (Washington)|SR 401]]; [[State Route 409 (Washington)|SR 409]]; [[State Route 411 (Washington)|SR 411]] ([[State Route 411 Spur (Washington)|Spur]]); [[State Route 432 (Washington)|SR 432]]; [[State Route 433 (Washington)|SR 433]]
|[[Washington State Route 401|SR 401]]; [[Washington State Route 409|SR 409]]; [[Washington State Route 411|SR 411]] ([[Washington State Route 411 Spur|Spur]]); [[Washington State Route 432|SR 432]]; [[Washington State Route 433|SR 433]]
|[[State Route 402 (Washington)|SR 402]]; [[State Route 403 (Washington)|SR 403]]; [[State Route 407 (Washington)|SR 407]]; [[State Route 431 (Washington)|SR 431]]
|[[Washington State Route 402|SR 402]]; [[Washington State Route 403|SR 403]]; [[Washington State Route 407|SR 407]]; [[Washington State Route 431|SR 431]]
|-
|-
!colspan=2|[[Interstate 5 (Washington)|Interstate 5]]
!colspan=2|[[Interstate 5|Interstate 5]]
|-
|-
|[[Interstate 205 (Washington)|I-205]]; [[Interstate 405 (Washington)|I-405]]; [[Interstate 705 (Washington)|I-705]]; [[State Route 500 (Washington)|SR 500]]; [[State Route 501 (Washington)|SR 501]]; [[State Route 502 (Washington)|SR 502]]; [[State Route 503 (Washington)|SR 503]] ([[State Route 503 Spur (Washington)|Spur]]); [[State Route 504 (Washington)|SR 504]] ([[State Route 504 Spur (Washington)|Spur]]); [[State Route 505 (Washington)|SR 505]]; [[State Route 506 (Washington)|SR 506]]; [[State Route 507 (Washington)|SR 507]]; [[State Route 508 (Washington)|SR 508]]; [[State Route 509 (Washington)|SR 509]]; [[State Route 510 (Washington)|SR 510]]; [[State Route 512 (Washington)|SR 512]]; [[State Route 513 (Washington)|SR 513]]; [[State Route 515 (Washington)|SR 515]]; [[State Route 516 (Washington)|SR 516]]; [[State Route 518 (Washington)|SR 518]]; [[State Route 519 (Washington)|SR 519]]; [[State Route 520 (Washington)|SR 520]]; [[State Route 522 (Washington)|SR 522]]; [[State Route 523 (Washington)|SR 523]]; [[State Route 524 (Washington)|SR 524]] ([[State Route 524 Spur (Washington)|Spur]]); [[State Route 525 (Washington)|SR 525]] ([[State Route 525 Spur (Washington)|Spur]]); [[State Route 526 (Washington)|SR 526]]; [[State Route 527 (Washington)|SR 527]]; [[State Route 528 (Washington)|SR 528]]; [[State Route 529 (Washington)|SR 529]] ([[State Route 529 Spur (Washington)|Spur]]); [[State Route 530 (Washington)|SR 530]]; [[State Route 531 (Washington)|SR 531]]; [[State Route 532 (Washington)|SR 532]]; [[State Route 534 (Washington)|SR 534]]; [[State Route 536 (Washington)|SR 536]]; [[State Route 538 (Washington)|SR 538]]; [[State Route 539 (Washington)|SR 539]]; [[State Route 542 (Washington)|SR 542]]; [[State Route 543 (Washington)|SR 543]]; [[State Route 544 (Washington)|SR 544]]; [[State Route 546 (Washington)|SR 546]]; [[State Route 547 (Washington)|SR 547]]; [[State Route 548 (Washington)|SR 548]]; [[State Route 599 (Washington)|SR 599]]
|[[Interstate 205|I-205]]; [[Interstate 405|I-405]]; [[Interstate 705|I-705]]; [[Washington State Route 500|SR 500]]; [[Washington State Route 501|SR 501]]; [[Washington State Route 502|SR 502]]; [[Washington State Route 503|SR 503]] ([[Washington State Route 503 Spur|Spur]]); [[Washington State Route 504|SR 504]] ([[Washington State Route 504 Spur|Spur]]); [[Washington State Route 505|SR 505]]; [[Washington State Route 506|SR 506]]; [[Washington State Route 507|SR 507]]; [[Washington State Route 508|SR 508]]; [[Washington State Route 509|SR 509]]; [[Washington State Route 510|SR 510]]; [[Washington State Route 512|SR 512]]; [[Washington State Route 513|SR 513]]; [[Washington State Route 515|SR 515]]; [[Washington State Route 516|SR 516]]; [[Washington State Route 518|SR 518]]; [[Washington State Route 519|SR 519]]; [[Washington State Route 520|SR 520]]; [[Washington State Route 522|SR 522]]; [[Washington State Route 523|SR 523]]; [[Washington State Route 524|SR 524]] ([[Washington State Route 524 Spur|Spur]]); [[Washington State Route 525|SR 525]] ([[Washington State Route 525 Spur|Spur]]); [[Washington State Route 526|SR 526]]; [[Washington State Route 527|SR 527]]; [[Washington State Route 528|SR 528]]; [[Washington State Route 529|SR 529]] ([[Washington State Route 529 Spur|Spur]]); [[Washington State Route 530|SR 530]]; [[Washington State Route 531|SR 531]]; [[Washington State Route 532|SR 532]]; [[Washington State Route 534|SR 534]]; [[Washington State Route 536|SR 536]]; [[Washington State Route 538|SR 538]]; [[Washington State Route 539|SR 539]]; [[Washington State Route 542|SR 542]]; [[Washington State Route 543|SR 543]]; [[Washington State Route 544|SR 544]]; [[Washington State Route 546|SR 546]]; [[Washington State Route 547|SR 547]]; [[Washington State Route 548|SR 548]]; [[Washington State Route 599|SR 599]]
|[[Interstate 605 (Washington)|I-605]]; [[State Route 514 (Washington)|SR 514]]; [[State Route 517 (Washington)|SR 517]]; [[State Route 537 (Washington)|SR 537]]; [[State Route 540 (Washington)|SR 540]]
|[[Interstate 605|I-605]]; [[Washington State Route 514|SR 514]]; [[Washington State Route 517|SR 517]]; [[Washington State Route 537|SR 537]]; [[Washington State Route 540|SR 540]]
|-
|-
!colspan=2|[[State Route 6 (Washington)|State Route 6]]
!colspan=2|[[Washington State Route 6|State Route 6]]
|-
|-
|
|
|[[State Route 603 (Washington)|SR 603]]
|[[Washington State Route 603|SR 603]]
|-
|-
!colspan=2|[[State Route 7 (Washington)|State Route 7]]
!colspan=2|[[Washington State Route 7|State Route 7]]
|-
|-
|[[State Route 702 (Washington)|SR 702]]; [[State Route 704 (Washington)|SR 704]]; [[State Route 706 (Washington)|SR 706]]
|[[Washington State Route 702|SR 702]]; [[Washington State Route 704|SR 704]]; [[Washington State Route 706|SR 706]]
|[[State Route 700 (Washington)|SR 700]]
|[[Washington State Route 700|SR 700]]
|-
|-
!colspan=2|[[State Route 8 (Washington)|State Route 8]]
!colspan=2|[[Washington State Route 8|State Route 8]]
|-
|-
|
|
|[[State Route 801 (Washington)|SR 801]]
|[[Washington State Route 801|SR 801]]
|-
|-
!colspan=2|[[State Route 9 (Washington)|State Route 9]]
!colspan=2|[[Washington State Route 9|State Route 9]]
|-
|-
|[[State Route 9 Spur (Washington)|SR 9 Spur]]; [[State Route 92 (Washington)|SR 92]]; [[State Route 96 (Washington)|SR 96]]
|[[Washington State Route 9 Spur|SR 9 Spur]]; [[Washington State Route 92|SR 92]]; [[Washington State Route 96|SR 96]]
|-
|-
!colspan=2|[[State Route 10 (Washington)|State Route 10]] (former [[U.S. Route 10 (Washington)|U.S. Route 10]])
!colspan=2|[[Washington State Route 10|State Route 10]] (former [[U.S. Route 10|U.S. Route 10]])
|-
|-
|[[State Route 410 (Washington)|SR 410]]
|[[Washington State Route 410|SR 410]]
|[[U.S. Route 410 (Washington)|US 410]]
|[[U.S. Route 410|US 410]]
|-
|-
!colspan=2|[[State Route 11 (Washington)|State Route 11]]
!colspan=2|[[Washington State Route 11|State Route 11]]
|-
|-
!colspan=2|[[U.S. Route 12 (Washington)|U.S. Route 12]]
!colspan=2|[[U.S. Route 12|U.S. Route 12]]
|-
|-
|[[State Route 121 (Washington)|SR 121]]; [[State Route 122 (Washington)|SR 122]]; [[State Route 123 (Washington)|SR 123]]; [[State Route 124 (Washington)|SR 124]]; [[State Route 125 (Washington)|SR 125]] ([[State Route 125 Spur (Washington)|Spur]]); [[State Route 127 (Washington)|SR 127]]; [[State Route 128 (Washington)|SR 128]]; [[State Route 129 (Washington)|SR 129]] ([[State Route 129 Spur (Washington)|Spur]]); [[State Route 131 (Washington)|SR 131]]
|[[Washington State Route 121|SR 121]]; [[Washington State Route 122|SR 122]]; [[Washington State Route 123|SR 123]]; [[Washington State Route 124|SR 124]]; [[Washington State Route 125|SR 125]] ([[Washington State Route 125 Spur|Spur]]); [[Washington State Route 127|SR 127]]; [[Washington State Route 128|SR 128]]; [[Washington State Route 129|SR 129]] ([[Washington State Route 129 Spur|Spur]]); [[Washington State Route 131|SR 131]]
|[[State Route 12 (Washington)|SR 12]]; [[State Route 120 (Washington)|SR 120]]; [[State Route 126 (Washington)|SR 126]]
|[[Washington State Route 12|SR 12]]; [[Washington State Route 120|SR 120]]; [[Washington State Route 126|SR 126]]
|-
|-
!colspan=2|[[U.S. Route 97 (Washington)|U.S. Route 97]] (functionally SR 13)
!colspan=2|[[U.S. Route 97|U.S. Route 97]] (functionally SR 13)
|-
|-
|
|
|[[State Route 131 (Washington)|SR 131]]
|[[Washington State Route 131|SR 131]]
|-
|-
!colspan=2|[[State Route 14 (Washington)|State Route 14]]
!colspan=2|[[Washington State Route 14|State Route 14]]
|-
|-
|[[State Route 14 Spur (Washington)|SR 14 Spur]]; [[State Route 141 (Washington)|SR 141]] ([[State Route 141 Spur (Washington)|Spur]]); [[State Route 142 (Washington)|SR 142]]
|[[Washington State Route 14 Spur|SR 14 Spur]]; [[Washington State Route 141|SR 141]] ([[Washington State Route 141 Spur|Spur]]); [[Washington State Route 142|SR 142]]
|[[State Route 140 (Washington)|SR 140]]; [[State Route 143 (Washington)|SR 143]]
|[[Washington State Route 140|SR 140]]; [[Washington State Route 143|SR 143]]
|-
|-
!colspan=2|[[U.S. Route 97 (Washington)|U.S. Route 97]] (functionally SR 15)
!colspan=2|[[U.S. Route 97|U.S. Route 97]] (functionally SR 15)
|-
|-
|[[State Route 150 (Washington)|SR 150]]; [[State Route 153 (Washington)|SR 153]]; [[State Route 155 (Washington)|SR 155]] ([[State Route 155 Spur (Washington)|Spur]])
|[[Washington State Route 150|SR 150]]; [[Washington State Route 153|SR 153]]; [[Washington State Route 155|SR 155]] ([[Washington State Route 155 Spur|Spur]])
|[[State Route 151 (Washington)|SR 151]]
|[[Washington State Route 151|SR 151]]
|-
|-
!colspan=2|[[State Route 16 (Washington)|State Route 16]]
!colspan=2|[[Washington State Route 16|State Route 16]]
|-
|-
|[[State Route 16 Spur (Washington)|SR 16 Spur]]; [[State Route 160 (Washington)|SR 160]]; [[State Route 161 (Washington)|SR 161]]; [[State Route 162 (Washington)|SR 162]]; [[State Route 163 (Washington)|SR 163]]; [[State Route 164 (Washington)|SR 164]]; [[State Route 165 (Washington)|SR 165]]; [[State Route 166 (Washington)|SR 166]]; [[State Route 167 (Washington)|SR 167]]; [[State Route 168 (Washington)|SR 168]]; [[State Route 169 (Washington)|SR 169]]
|[[Washington State Route 16 Spur|SR 16 Spur]]; [[Washington State Route 160|SR 160]]; [[Washington State Route 161|SR 161]]; [[Washington State Route 162|SR 162]]; [[Washington State Route 163|SR 163]]; [[Washington State Route 164|SR 164]]; [[Washington State Route 165|SR 165]]; [[Washington State Route 166|SR 166]]; [[Washington State Route 167|SR 167]]; [[Washington State Route 168|SR 168]]; [[Washington State Route 169|SR 169]]
|-
|-
!colspan=2|[[State Route 17 (Washington)|State Route 17]]
!colspan=2|[[Washington State Route 17|State Route 17]]
|-
|-
|[[State Route 170 (Washington)|SR 170]]; [[State Route 171 (Washington)|SR 171]]; [[State Route 172 (Washington)|SR 172]]; [[State Route 173 (Washington)|SR 173]]; [[State Route 174 (Washington)|SR 174]] ([[State Route 174 Spur (Washington)|Spur]])
|[[Washington State Route 170|SR 170]]; [[Washington State Route 171|SR 171]]; [[Washington State Route 172|SR 172]]; [[Washington State Route 173|SR 173]]; [[Washington State Route 174|SR 174]] ([[Washington State Route 174 Spur|Spur]])
|[[State Route 175 (Washington)|SR 175]]
|[[Washington State Route 175|SR 175]]
|-
|-
!colspan=2|[[State Route 18 (Washington)|State Route 18]]
!colspan=2|[[Washington State Route 18|State Route 18]]
|-
|-
|[[State Route 181 (Washington)|SR 181]]
|[[Washington State Route 181|SR 181]]
|-
|-
!colspan=2|[[State Route 19 (Washington)|State Route 19]]
!colspan=2|[[Washington State Route 19|State Route 19]]
|-
|-
!colspan=2|[[U.S. Route 195 (Washington)|U.S. Route 195]] (functionally SR 19)
!colspan=2|[[U.S. Route 195|U.S. Route 195]] (functionally SR 19)
|-
|-
|[[State Route 193 (Washington)|SR 193]]; [[State Route 194 (Washington)|SR 194]]
|[[Washington State Route 193|SR 193]]; [[Washington State Route 194|SR 194]]
|-
|-
!colspan=2|[[State Route 20 (Washington)|State Route 20]]
!colspan=2|[[Washington State Route 20|State Route 20]]
|-
|-
|[[State Route 20 Spur (Washington)|SR 20 Spur]]; [[State Route 211 (Washington)|SR 211]]; [[State Route 213 (Washington)|SR 213]]; [[State Route 215 (Washington)|SR 215]]
|[[Washington State Route 20 Spur|SR 20 Spur]]; [[Washington State Route 211|SR 211]]; [[Washington State Route 213|SR 213]]; [[Washington State Route 215|SR 215]]
|-
|-
!colspan=2|[[State Route 21 (Washington)|State Route 21]]
!colspan=2|[[Washington State Route 21|State Route 21]]
|-
|-
!colspan=2|[[State Route 22 (Washington)|State Route 22]]
!colspan=2|[[Washington State Route 22|State Route 22]]
|-
|-
|[[State Route 221 (Washington)|SR 221]]; [[State Route 223 (Washington)|SR 223]]; [[State Route 224 (Washington)|SR 224]]; [[State Route 225 (Washington)|SR 225]]
|[[Washington State Route 221|SR 221]]; [[Washington State Route 223|SR 223]]; [[Washington State Route 224|SR 224]]; [[Washington State Route 225|SR 225]]
|[[State Route 220 (Washington)|SR 220]]
|[[Washington State Route 220|SR 220]]
|-
|-
!colspan=2|[[State Route 23 (Washington)|State Route 23]]
!colspan=2|[[Washington State Route 23|State Route 23]]
|-
|-
|[[State Route 230 (Washington)|SR 230]]; [[State Route 231 (Washington)|SR 231]]
|[[Washington State Route 230|SR 230]]; [[Washington State Route 231|SR 231]]
|[[State Route 232 (Washington)|SR 232]]; [[State Route 237 (Washington)|SR 237]]
|[[Washington State Route 232|SR 232]]; [[Washington State Route 237|SR 237]]
|-
|-
!colspan=2|[[State Route 24 (Washington)|State Route 24]]
!colspan=2|[[Washington State Route 24|State Route 24]]
|-
|-
|[[State Route 240 (Washington)|SR 240]]; [[State Route 241 (Washington)|SR 241]]; [[State Route 243 (Washington)|SR 243]]
|[[Washington State Route 240|SR 240]]; [[Washington State Route 241|SR 241]]; [[Washington State Route 243|SR 243]]
|-
|-
!colspan=2|[[State Route 25 (Washington)|State Route 25]]
!colspan=2|[[Washington State Route 25|State Route 25]]
|-
|-
|
|
|[[State Route 251 (Washington)|SR 251]]
|[[Washington State Route 251|SR 251]]
|-
|-
!colspan=2|[[State Route 26 (Washington)|State Route 26]]
!colspan=2|[[Washington State Route 26|State Route 26]]
|-
|-
|[[State Route 26 Spur (Washington)|SR 26 Spur]]; [[State Route 260 (Washington)|SR 260]]; [[State Route 261 (Washington)|SR 261]]; [[State Route 262 (Washington)|SR 262]]; [[State Route 263 (Washington)|SR 263]]
|[[Washington State Route 26 Spur|SR 26 Spur]]; [[Washington State Route 260|SR 260]]; [[Washington State Route 261|SR 261]]; [[Washington State Route 262|SR 262]]; [[Washington State Route 263|SR 263]]
|-
|-
!colspan=2|[[State Route 27 (Washington)|State Route 27]]
!colspan=2|[[Washington State Route 27|State Route 27]]
|-
|-
|[[State Route 270 (Washington)|SR 270]]; [[State Route 271 (Washington)|SR 271]]; [[State Route 272 (Washington)|SR 272]]; [[State Route 274 (Washington)|SR 274]]; [[State Route 276 (Washington)|SR 276]]; [[State Route 278 (Washington)|SR 278]]
|[[Washington State Route 270|SR 270]]; [[Washington State Route 271|SR 271]]; [[Washington State Route 272|SR 272]]; [[Washington State Route 274|SR 274]]; [[Washington State Route 276|SR 276]]; [[Washington State Route 278|SR 278]]
|-
|-
!colspan=2|[[State Route 28 (Washington)|State Route 28]]
!colspan=2|[[Washington State Route 28|State Route 28]]
|-
|-
|[[State Route 281 (Washington)|SR 281]] ([[State Route 281 Spur (Washington)|Spur]]); [[State Route 282 (Washington)|SR 282]]; [[State Route 283 (Washington)|SR 283]]; [[State Route 285 (Washington)|SR 285]]
|[[Washington State Route 281|SR 281]] ([[Washington State Route 281 Spur|Spur]]); [[Washington State Route 282|SR 282]]; [[Washington State Route 283|SR 283]]; [[Washington State Route 285|SR 285]]
|-
|-
!colspan=2|[[U.S. Route 395 (Washington)|U.S. Route 395]] (functionally SR 29)
!colspan=2|[[U.S. Route 395|U.S. Route 395]] (functionally SR 29)
|-
|-
|[[State Route 290 (Washington)|SR 290]] ([[State Route 290 Spur (Washington)|Spur]]); [[State Route 291 (Washington)|SR 291]]; [[State Route 292 (Washington)|SR 292]]
|[[Washington State Route 290|SR 290]] ([[Washington State Route 290 Spur|Spur]]); [[Washington State Route 291|SR 291]]; [[Washington State Route 292|SR 292]]
|[[State Route 294 (Washington)|SR 294]]
|[[Washington State Route 294|SR 294]]
|-
|-
!colspan=2|[[State Route 30 (Washington)|State Route 30]] (deleted)
!colspan=2|[[Washington State Route 30|State Route 30]] (deleted)
|-
|-
!colspan=2|[[U.S. Route 30]] (never entered Washington)
!colspan=2|[[U.S. Route 30]] (never entered Washington)
|-
|-
|[[U.S. Route 730 (Washington)|US 730]] ([[U.S. Route 730 Spur (Washington)|Spur]])
|[[U.S. Route 730|US 730]] ([[U.S. Route 730 Spur|Spur]])
|[[U.S. Route 830 (Washington)|US 830]]; [[State Route 831 (Washington)|SR 831]]; [[State Route 832 (Washington)|SR 832]]; [[State Route 833 (Washington)|SR 833]]
|[[U.S. Route 830|US 830]]; [[Washington State Route 831|SR 831]]; [[Washington State Route 832|SR 832]]; [[Washington State Route 833|SR 833]]
|-
|-
!colspan=2|[[State Route 31 (Washington)|State Route 31]]
!colspan=2|[[Washington State Route 31|State Route 31]]
|-
|-
|
|
|[[State Route 311 (Washington)|SR 311]]
|[[Washington State Route 311|SR 311]]
|-
|-
!colspan=2|[[State Route 35 (Washington)|State Route 35]]
!colspan=2|[[Washington State Route 35|State Route 35]]
|-
|-
!colspan=2|[[State Route 41 (Washington)|State Route 41]]
!colspan=2|[[Washington State Route 41|State Route 41]]
|-
|-
!colspan=2|[[Interstate 82 (Washington)|Interstate 82]]
!colspan=2|[[Interstate 82|Interstate 82]]
|-
|-
|[[Interstate 182 (Washington)|Interstate 182]]; [[State Route 821 (Washington)|SR 821]]; [[State Route 823 (Washington)|SR 823]]
|[[Interstate 182|Interstate 182]]; [[Washington State Route 821|SR 821]]; [[Washington State Route 823|SR 823]]
|-
|-
!colspan=2|[[Interstate 90 (Washington)|Interstate 90]]
!colspan=2|[[Interstate 90|Interstate 90]]
|-
|-
|[[State Route 900 (Washington)|SR 900]]; [[State Route 902 (Washington)|SR 902]]; [[State Route 903 (Washington)|SR 903]] ([[State Route 903 Spur (Washington)|Spur]]); [[State Route 904 (Washington)|SR 904]]; [[State Route 906 (Washington)|SR 906]] ([[State Route 906 Spur (Washington)|Spur]]); [[State Route 908 (Washington)|SR 908]]
|[[Washington State Route 900|SR 900]]; [[Washington State Route 902|SR 902]]; [[Washington State Route 903|SR 903]] ([[Washington State Route 903 Spur|Spur]]); [[Washington State Route 904|SR 904]]; [[Washington State Route 906|SR 906]] ([[Washington State Route 906 Spur|Spur]]); [[Washington State Route 908|SR 908]]
|[[State Route 901 (Washington)|SR 901]]; [[State Route 920 (Washington)|SR 920]]
|[[Washington State Route 901|SR 901]]; [[Washington State Route 920|SR 920]]
|-
|-
!colspan=2|[[U.S. Route 95 (Washington)|U.S. Route 95]] (no longer enters Washington)
!colspan=2|[[U.S. Route 95|U.S. Route 95]] (no longer enters Washington)
|-
|-
|[[U.S. Route 195 (Washington)|US 195]] ([[U.S. Route 195 Spur (Washington)|Spur]]); [[U.S. Route 395 (Washington)|US 395]]; [[State Route 397 (Washington)|SR 397]]
|[[U.S. Route 195|US 195]] ([[U.S. Route 195 Spur|Spur]]); [[U.S. Route 395|US 395]]; [[Washington State Route 397|SR 397]]
|[[U.S. Route 295 (Washington)|US 295]]
|[[U.S. Route 295|US 295]]
|-
|-
!colspan=2|[[U.S. Route 97 (Washington)|U.S. Route 97]]
!colspan=2|[[U.S. Route 97|U.S. Route 97]]
|-
|-
|[[U.S. Route 97 Alternate (Washington)|US 97 Alternate]]; [[U.S. Route 97 Spur (Washington)|US 97 Spur]]; [[U.S. Route 197 (Washington)|US 197]]; [[State Route 970 (Washington)|SR 970]]; [[State Route 971 (Washington)|SR 971]]
|[[U.S. Route 97 Alternate|US 97 Alternate]]; [[U.S. Route 97 Spur|US 97 Spur]]; [[U.S. Route 197|US 197]]; [[Washington State Route 970|SR 970]]; [[Washington State Route 971|SR 971]]
|-
|-
!colspan=2|[[State Route 99 (Washington)|State Route 99]] (former [[U.S. Route 99 (Washington)|U.S. Route 99]])
!colspan=2|[[Washington State Route 99|State Route 99]] (former [[U.S. Route 99|U.S. Route 99]])
|-
|-
|
|
Line 209: Line 209:


==External links==
==External links==
{{Portal US Roads}}
*[http://www.wsdot.wa.gov/ Washington State Department of Transportation]
*[http://www.wsdot.wa.gov/ Washington State Department of Transportation]
*[http://phenry.org/wsh/ Washington Highways Page]
*[http://phenry.org/wsh/ Washington Highways Page]

Revision as of 06:24, 31 March 2006

The State Route shield contains the number inside a silhouette of George Washington's head.

In the U.S. state of Washington, every state highway - a road owned and maintained by the Washington State Department of Transportation (WSDOT) - is assigned a State Route number by state law. These are named state route number X in the legal descriptions,[1] and are called State Route X (commonly abbreviated SR X) by WSDOT. These State Routes include roads signed as U.S. Routes or Interstate Highways.

Numbering pattern

A rough grid of two-digit numbers is assigned to major routes; U.S. Routes and Interstate Highways make the grid imperfect. Odd-numbered routes stretch from U.S. Route 101 (functionally a State Route 1) in the west to State Route 31 in the east. Even-numbered routes run in three general strips, roughly separated by Interstate 5 and the Columbia River. The westernmost strip runs from State Route 4 north to State Route 8 (2 and 10 are used up by U.S. Route 2 and former U.S. Route 10). The next strip runs from State Route 14 (former State Route 12 before U.S. Route 12 was extended into the state) north to State Route 20, and the eastern strip runs from State Route 22 to State Route 28 (formerly to State Route 30, now part of SR 20).

Less major routes are assigned three-digit numbers, as a spur of a major route. One or two digits are added onto the end of the "parent" to form the three-digit number. For instance, U.S. Route 101 (functionally SR 1) has spurs of State Route 104 and State Route 117, Interstate 5 has spurs of State Route 505 and State Route 527, and State Route 26 has State Route 261 as a spur. Spurs of State Route 20 begin with 21, as 20X is used by spurs of U.S. Route 2. (State Route 10 has no spurs, and neither did State Route 30.) Several unused two-digit numbers are assigned functionally to U.S. Routes - for instance U.S. Route 97 fits as SR 15, so one of its spurs is State Route 153. Similarly, a spur of U.S. Route 395, functionally SR 29, is State Route 291. On the other hand, both of these have newer spurs assigned based on their U.S. Route numbers - State Route 971 and State Route 397 for instance. This method had been used since the beginning for some spurs of U.S. Route 830 (since renumbered as spurs of State Route 4), though other spurs were numbered by its location in the grid (as SR 4 and SR 12).

The two spurs of State Route 9 are State Route 92 and State Route 96, as three-digit numbers beginning with 90 are in use by Interstate 90.

History

The first state road, running across the Cascade Range roughly where State Route 20 now crosses it, was designated by the legislature in 1893. Two other roads - a Cascade crossing at present State Route 410 and a branch of the first road to Wenatchee - were added in 1897. The Washington Highway Department was established in 1905, and a set of twelve State Roads, numbered from 1 to 12, were assigned. A thirteenth was added in 1907, and SR 14 to SR 18 in 1909.[2][3]

However, it was not until 1913 that a connected system was laid out - earlier state roads had been disconnected segments of road needing improvements. The seven primary roads were only assigned names, while the older state roads kept their numbers as secondary roads. In 1923, most state roads were assigned new numbers, though the primary and secondary split remained, and several roads remained named only.[3] The United States Numbered Highways were assigned in late 1926, overlapping some of the State Roads.

The first major reworking of the system was passed in 1937, including a complete renumbering. A number of Primary State Highways were designated, while Secondary State Highways were suffixed spurs off of those. For instance, Primary State Highway 1 was the Pacific Highway (present Interstate 5), and Secondary State Highway 1B was a spur from Bellingham to the Canadian border (now State Route 539). U.S. Routes kept dual designations with State Highways.[3] By 1952, the present highway shield, in the shape of George Washington's head, had been adopted.[4]

Main article: 1964 state highway renumbering (Washington)

In 1963, a law was passed authorizing a new numbering for sign routes. These would coincide with the U.S. Route designations, as well as the Interstate Highway numbers assigned in 1959, and would provide a non-suffixed number for every stretch of state highway. The present numbering system was adopted then.[5] Signs for the new sign routes were posted in January 1964, and until 1970 they coexisted with the older state highway numbers. At that time, the legislative definitions were changed to use the sign route numbers, renamed state routes. Those definitions, with amendments, are still in use today.[6]

List of State Routes

Current State Routes Former or proposed State Routes
U.S. Route 101 (functionally SR 1)
SR 100 (Spur); SR 102; SR 103; SR 104; SR 105 (Spur); SR 106; SR 107; SR 108; SR 109 (Spur); SR 110 (Spur); SR 112; SR 113; SR 115; SR 116; SR 117; SR 119 US 101 Alternate; SR 111; SR 118
U.S. Route 2
SR 202; SR 203; SR 204; SR 206; SR 207 SR 200; SR 209
State Route 3
SR 300; SR 302 (Spur); SR 303; SR 304; SR 305; SR 307; SR 308; SR 310; SR 339 SR 306
State Route 4
SR 401; SR 409; SR 411 (Spur); SR 432; SR 433 SR 402; SR 403; SR 407; SR 431
Interstate 5
I-205; I-405; I-705; SR 500; SR 501; SR 502; SR 503 (Spur); SR 504 (Spur); SR 505; SR 506; SR 507; SR 508; SR 509; SR 510; SR 512; SR 513; SR 515; SR 516; SR 518; SR 519; SR 520; SR 522; SR 523; SR 524 (Spur); SR 525 (Spur); SR 526; SR 527; SR 528; SR 529 (Spur); SR 530; SR 531; SR 532; SR 534; SR 536; SR 538; SR 539; SR 542; SR 543; SR 544; SR 546; SR 547; SR 548; SR 599 I-605; SR 514; SR 517; SR 537; SR 540
State Route 6
SR 603
State Route 7
SR 702; SR 704; SR 706 SR 700
State Route 8
SR 801
State Route 9
SR 9 Spur; SR 92; SR 96
State Route 10 (former U.S. Route 10)
SR 410 US 410
State Route 11
U.S. Route 12
SR 121; SR 122; SR 123; SR 124; SR 125 (Spur); SR 127; SR 128; SR 129 (Spur); SR 131 SR 12; SR 120; SR 126
U.S. Route 97 (functionally SR 13)
SR 131
State Route 14
SR 14 Spur; SR 141 (Spur); SR 142 SR 140; SR 143
U.S. Route 97 (functionally SR 15)
SR 150; SR 153; SR 155 (Spur) SR 151
State Route 16
SR 16 Spur; SR 160; SR 161; SR 162; SR 163; SR 164; SR 165; SR 166; SR 167; SR 168; SR 169
State Route 17
SR 170; SR 171; SR 172; SR 173; SR 174 (Spur) SR 175
State Route 18
SR 181
State Route 19
U.S. Route 195 (functionally SR 19)
SR 193; SR 194
State Route 20
SR 20 Spur; SR 211; SR 213; SR 215
State Route 21
State Route 22
SR 221; SR 223; SR 224; SR 225 SR 220
State Route 23
SR 230; SR 231 SR 232; SR 237
State Route 24
SR 240; SR 241; SR 243
State Route 25
SR 251
State Route 26
SR 26 Spur; SR 260; SR 261; SR 262; SR 263
State Route 27
SR 270; SR 271; SR 272; SR 274; SR 276; SR 278
State Route 28
SR 281 (Spur); SR 282; SR 283; SR 285
U.S. Route 395 (functionally SR 29)
SR 290 (Spur); SR 291; SR 292 SR 294
State Route 30 (deleted)
U.S. Route 30 (never entered Washington)
US 730 (Spur) US 830; SR 831; SR 832; SR 833
State Route 31
SR 311
State Route 35
State Route 41
Interstate 82
Interstate 182; SR 821; SR 823
Interstate 90
SR 900; SR 902; SR 903 (Spur); SR 904; SR 906 (Spur); SR 908 SR 901; SR 920
U.S. Route 95 (no longer enters Washington)
US 195 (Spur); US 395; SR 397 US 295
U.S. Route 97
US 97 Alternate; US 97 Spur; US 197; SR 970; SR 971
State Route 99 (former U.S. Route 99)
US 99 Alternate

Several bridges have been defined as part of the state highway system:

Most ocean beaches are also drivable in Washington, though many are only open to vehicles between the day after Labor Day and April 14. They are legally part of the state highway system with a general speed limit of 25 MPH.[citation needed]

References

  1. ^ Revised Code of Washington Chapter 47.17 - State highway routes
  2. ^ State Roads As Established by Legislature, 1893 to 1935 (PDF)
  3. ^ a b c Historical Collection - 40 Years with the Washington Department of Highways
  4. ^ Twenty-Fourth Biennial Report of the Washington Highway Commission 1950-52, U. S. Route directional marking assembly supplemented by overhead mast arm supported standard destination signs in Tenino, Washington.
  5. ^ Washington State Highway Commission, December 1, 1965, Identification of State Highways, part 1 and part 2 (PDF)
  6. ^ Highways of Washington State - State Highways aka State Routes (SRs)

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