Interstate 505

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Interstate 505 marker

Interstate 505
I-505 highlighted in red
Route information
Defined by Streets and Highways Code § 617
Maintained by Caltrans
Length: 32.99 mi[1] (53.09 km)
Existed: 1977 – present
Major junctions
South end: I-80 in Vacaville
North end: I-5 near Dunnigan
Counties: Solano, Yolo
Highway system
SR 480 I-580

Interstate 505 (I-505) is an Interstate Highway in California between Interstate 80 in Vacaville and Interstate 5 near Dunnigan. I-505 is primarily a rural interstate, but travels through Vacaville and the city of Winters. The interstate is the primary route connecting the San Francisco Bay Area and the northern Sacramento Valley, bypassing Sacramento and its attendant city traffic. Thus, it is a major route for travelers heading directly from the San Francisco Bay Area to the Pacific Northwest.

Power lines connecting Path 15 to Path 66 follow the highway for a while, until one heads northeast and the other northwest.

Route description[edit]

The southern terminus of I-505 is at I-80 next to the Nut Tree Airport in the Nut Tree area in Vacaville. From there, it travels north about ten miles through rural areas near the western edge of the Sacramento Valley before reaching Winters. I-505 then skirts the eastern city limits of Winters, intersecting with State Route 128 – the only exit in Winters. After leaving that city, the interstate then proceeds north through rural areas again for about 20 miles until it reaches its northern terminus with I-5 near Dunnigan.

For most of its length, I-505 is a four-lane freeway, which is typical for rural interstates in California.

I-505 is part of the California Freeway and Expressway System,[2] and is part of the National Highway System,[3] a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration.[4]


What is now I-505 was originally conceived as part of a loop Interstate with a directional suffix, I-5W.[5] However, I-5W and most of the other Interstates around the country with directional suffixes were eventually renumbered or eliminated, sans I-35E and I-35W in Texas and Minnesota. The former route of I-5W now corresponds to I-580 from I-5 south of Tracy to Oakland, I-80 from Oakland to Vacaville, and I-505 from Vacaville to I-5 near Dunnigan.

Exit list[edit]

County Location mi
km Exit
Destinations Notes
Solano Vacaville 0.00 0.00 1 I-80 – San Francisco, Sacramento Southbound exit and northbound entrance; signed as exit 1A (west) and 1B (east); south end of I-505; I-80 exit 56
0.00 0.00 Orange Drive, Nut Tree Road Northbound exit (from I-80 east) and entrance
0.00 0.00 1B Monte Vista Avenue Southbound exit and entrance (to I-80 east)
1.45 2.33 1C Vaca Valley Parkway Signed as exit 1 northbound
3.06 4.92 3 Midway Road
5.57 8.96 6 Allendale Road
10.43 16.79 10 Putah Creek Road
Yolo 11.03 17.75 11 SR 128 west / CR E6 east – Winters, Davis
14.66 23.59 15 Road 29A
17.16 27.62 17 Road 27
21.25 34.20 21 SR 16 – Woodland, Esparto
24.06 38.72 24 Road 19
28.08 45.19 28 CR E10 (Road 14) – Zamora
30.74 49.47 31 Road 12A
32.99 53.09 I-5 north – Redding Northbound exit and southbound entrance; north end of I-505; I-5 south exit 553
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also[edit]


  1. ^ California Department of Transportation (October 2014). "Log of Bridges on State Highways". Sacramento: California Department of Transportation. 
  2. ^ California State Legislature. "Section 250–257". Streets and Highways Code. Sacramento: California State Legislature. Retrieved June 9, 2017. 
  3. ^ Federal Highway Administration (March 25, 2015). National Highway System: California (North) (PDF) (Map). Scale not given. Washington, DC: Federal Highway Administration. Retrieved July 29, 2017. 
  4. ^ Natzke, Stefan; Neathery, Mike & Adderly, Kevin (June 20, 2012). "What is the National Highway System?". National Highway System. Washington, DC: Federal Highway Administration. Retrieved July 1, 2012. 
  5. ^ "California Highways-Routes 1-8". California Highways. Retrieved 2012-09-03. 
  6. ^ a b California Department of Transportation, California Numbered Exit Uniform System, Interstate 505 Freeway Interchanges, Retrieved on 2009-02-07.

External links[edit]

Route map: Google

KML is from Wikidata