Interstate 80 Business (Sacramento, California)

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Interstate 80 Business marker

Interstate 80 Business
Capital City Freeway
Business 80 highlighted in red
Route information
Defined by Streets and Highways Code § 350 and 351
Maintained by Caltrans
Length: 14.50 mi[2] (23.34 km)
Existed: 1979 by FHWA
1983 (from I-80) by Caltrans[1] – present
Major junctions
West end: I-80 in West Sacramento
East end: I-80 / SR 244 in Sacramento
Counties: Yolo, Sacramento
Highway system
US 50 51 SR 52

Interstate 80 Business, called the Capital City Freeway in its entirety, is a business loop of Interstate 80 through Sacramento. Although signed as a business loop the route is actually two connected segments. The western segment is signed as U.S. Route 50 and carries the unsigned designation of Interstate 305. The unsigned designation of the eastern segment is State Route 51. The entire route is a freeway, and carried mainline Interstate 80 through Sacramento until the early 1980s. Portions of the eastern half were initially grandfathered into the Interstate Highway system; however, plans to upgrade or realign this portion to meet Interstate Highway standards were cancelled. As such, the I-80 designation through Sacramento was moved to a northern bypass of the city that had previously been signed Interstate 880 (which was later reassigned to what had been State Route 17 between Oakland and San Jose), and the old route of I-80 through downtown was given the current business loop designation.

Route description[edit]

Western section[edit]

Business 80 begins in West Sacramento at Interstate 80, where I-80 leaves the West Sacramento Freeway onto the Beltline Freeway (which travels north of the Bryte neighborhood, over the Sacramento River, and into the Natomas area). This interchange in West Sacramento is also the current west end of U.S. Route 50 and the west end of the unsigned I-305.

In downtown West Sacramento, Business 80 and US 50 split from the West Sacramento Freeway, which is now locally maintained in part over the Tower Bridge up to the door of the capitol, but was once signed as State Route 275. Business 80 crosses the Sacramento River on the Pioneer Memorial Bridge, intersecting with Interstate 5 on the east bank. State Route 99 once ran along I-5 to the north and Business 80 to the east, but this is now signed TO SR 99. After crossing I-5, Business 80 runs on top of an embankment between W and X streets; this was originally known as the WX Freeway.

Eastern section[edit]

At an interchange southeast of downtown Sacramento, Business 80 turns north onto the south end of unsigned SR 51. US 50 continues east, State Route 99 heads south, and the "hidden" I-305 ends. The elevated freeway carrying Business 80 east of downtown is between 29th and 30th Streets, and an older section beginning at A Street and continuing northeast was originally known as the Elvas Freeway (and originally signed as U.S Highway 99 East). On this section of freeway, Business 80 crosses the American River before its northeast-bound merge with the North Sacramento Freeway (the northern portion of State Route 160 towards downtown).

The North Sacramento Freeway, originally a portion of U.S. Route 40, originally ran west from Marconi Avenue to an intersection with Del Paso Boulevard. The section from Arden Way eastbound back to Marconi Avenue is now part of the currently named Capital City Freeway (while the SR 160 section retains the original freeway name). The original North Sacramento Freeway connected to the Roseville Freeway at the curve north of Marconi Avenue (commonly known as the Marconi Curve, where the freeway once ended at Auburn Boulevard). At the east end of Business 80, the Roseville Freeway continues northeast to Roseville as Interstate 80, while the short unsigned State Route 244 heads east to Auburn Boulevard.

I-80 heads in both directions around the north side of Sacramento. A partially built portion of a never completed replacement freeway for SR 51, in the median of I-80, now serves as parking and access for the northernmost three stations (Watt/I-80, Watt/I-80 West, and Roseville Road) on the Sacramento Regional Transit District's light rail Blue Line. If this replacement freeway had been completely built as originally planned, I-80 would have continued south following the railroad tracks going through the Ben Ali neighborhood of North Sacramento, crossed over SR 160, and joined with the Elvas Freeway portion just north of A Street.

Route confusion[edit]

Business Loop 80 is referred to as Business 80, the 80, Biz 80, Capital City Freeway, Cap City Fwy, and US 50 (western section only) by residents and mapmakers. Caltrans does not normally use the Business 80 designation, except for signage and other related concepts like Cal-NExUS exit numbers (which are continuous along the business loop). Caltrans refers to the western half as US 50 and the eastern half as SR 51 for traffic condition reporting. The Caltrans traffic camera system refers to the route by its name, Capital City Freeway.

The SR 99 concurrency is not officially designated by Caltrans, but mapmakers often show it as such. SR 99 signage had existed along that route for motorists' convenience, but was removed in 2000, and replaced by TO SR 99 signs instead.

Beginning in 2016, signs on the western section were updated to remove references to Business 80 and instead sign the route only as US Highway 50. The eastern section shall remain signed as Business 80. [3] This was intended to reduce confusion between multiple highways numbered 80.


Business 80 was part of Interstate 80 until the early 1980s, with the actual signage change occurring in 1983. The replacement for the North Sacramento Freeway was cancelled in 1978, and in 1979 the Federal Highway Administration removed it from the Interstate Highway System, redesignating the west half of the Capital City Freeway (which met Interstate Highway standards) as I-305. The east half was designated Federal Aid Primary 51. The next year, the California State Legislature extended U.S. Route 50 west to cover the west half of old I-80, and the east half was assigned the new SR 51 number (last used in 1965 for a short route in Orange).[1] (The Interstate 880 designation, which had been used for the Beltline Freeway, was reused in 1984 for the Nimitz Freeway in the east bay communities of the San Francisco Bay Area.)

The old I-80 was never signed as US 50 (alone) or SR 51, but as a business route. Unlike most business routes in California, which run along locally-maintained streets through a downtown area, Business 80 was not assigned to the pre-freeway alignment of U.S. Route 40, but to a freeway. The existence of two freeways, both numbered 80, has caused some confusion, and in 1996 the full route was given the Capital City Freeway name. This name appears on overhead signs at prominent interchanges.

An earlier State Route 51 was defined on July 1, 1964 on a section of pre-1964 Legislative Route 2, providing a loop east of Interstate 5 (pre-1964 Legislative Route 174 there) through Orange, around the Orange Crush Interchange. It was removed from the state highway system in 1965.[4][5]

Exit list[edit]

County Location mi[6] km Exit[6] Destinations Notes
Yolo West Sacramento 0.00 0.00 I-80 west – San Francisco Western terminus; west end of US 50 concurrency; west end of US 50 and unsigned I-305; former US 40 west / US 99W north; I-80 exit 82
0.35 0.56 1A I-80 east – Reno Westbound exit and eastbound entrance; former I-880 east
1.20 1.93 1B Harbor Boulevard Signed as exit 1 eastbound
2.50 4.02 3 Downtown Sacramento (SR 275) / Jefferson Boulevard (SR 84) Eastbound exit and westbound entrance; SR 275 was former US 40 east / US 99W south
Jefferson Boulevard (SR 84), South River Road Westbound exit and eastbound entrance
Sacramento Sacramento 3.51 5.65 4A I-5 to SR 99 north – Redding, Los Angeles I-5 exit 518
3.77 6.07 4B 5th Street – Downtown Sacramento Eastbound exit and westbound entrance; former SR 99
10th Street – Downtown Sacramento Westbound exit and eastbound entrance
4.53 7.29 5 15th Street, 16th Street Former US 99W[7] / SR 160
5.64 9.08 6A US 50 east (Lincoln Highway) / SR 99 south (South Sacramento Freeway) – South Lake Tahoe, Fresno East end of US 50 concurrency; east end of unsigned I-305; south end of unsigned SR 51; exit number is for US 50 east, no exit number eastbound; US 50 west exit 6C
5.88 9.46 6C P Street Westbound exit and eastbound entrance
6.48 10.43 7A N Street Eastbound exit and westbound entrance
J Street Westbound exit and eastbound entrance
6.84 11.01 7B H Street Eastbound exit and westbound entrance
E Street Westbound exit and eastbound entrance
9.00 14.48 9A Exposition Boulevard – Cal Expo Eastbound entrance is via SR 160
9.33 15.02 9B SR 160 south (North Sacramento Freeway) – Downtown Sacramento Former US 40[8]
9.70 15.61 10A Arden Way Eastbound exit is part of exit 9B
10.38 16.70 10B El Camino Avenue – Carmichael Signed as exit 10 eastbound
11.14 17.93 11 Auburn Boulevard, Marconi Avenue No eastbound entrance
11.60 18.67 12A Howe Avenue Eastbound exit and entrance
11.85 19.07 12B Auburn Boulevard, Bell Street Eastbound exit only; Auburn Boulevard was former US 40
12.43 20.00 12C Fulton Avenue Signed as exit 12 westbound
13.61 21.90 14B Watt Avenue Signed as exits 14A (south) and 14B (north) eastbound; connects to I-80 west
14.23 22.90 14C Auburn Boulevard (SR 244) No eastbound exit; signed as exit 14A westbound; Auburn Boulevard was former US 40
14.50 23.34 I-80 east – Reno Eastern terminus; north end of unsigned SR 51; I-80 west exit 95
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also[edit]


  1. ^ a b "Interstate 80". California Highways. Retrieved October 4, 2014. 
  2. ^ "January 1, 2006 California Log of Bridges on State Highways". California Department of Transportation. Retrieved October 4, 2014. 
  3. ^
  4. ^ District VII State Highway Numbering Map, September 20, 1963
  5. ^ "Route 51". California Highways. Retrieved October 4, 2014. 
  6. ^ a b Warring, KS (June 18, 2008). "Interstate 80 Business Interchanges" (PDF). California Numbered Exit Uniform System. California Department of Transportation. Retrieved August 6, 2016. 
  7. ^ Windmiller, Joel. "Elvas Freeway — US 99E (map of Sacramento showing the routing of US 99W)". Golden State Highways. Archived from the original on July 9, 2011. Retrieved July 23, 2011. 
  8. ^ "Elvas Freeway - US 99E (photo of signage)". Joel Windmiller. Archived from the original on February 17, 2004. Retrieved February 27, 2009. 

External links[edit]

Route map: Google

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