Interstate 505

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For the never-built spur in Portland, Oregon, see Interstate 505 (Oregon).

Interstate 505 marker

Interstate 505
Route information
Defined by S&HC § 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
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.

This route is part of the California Freeway and Expressway System.[2]

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.


What is now I-505 was originally conceived as part of a loop Interstate with a directional suffix, I-5W.[3] 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]

Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, based on the alignment that existed at the time, and do not necessarily reflect current mileage. R reflects a realignment in the route since then, M indicates a second realignment, L refers an overlap due to a correction or change, and T indicates postmiles classified as temporary (for a full list of prefixes, see the list of postmile definitions).[4] Segments that remain unconstructed or have been relinquished to local control may be omitted. The numbers reset at county lines; the start and end postmiles in each county are given in the county column.

County Location Postmile
Destinations Notes
SOL R0.00-R10.63
Vacaville R0.00 1 I‑80 – San Francisco, Sacramento Southbound exit and northbound entrance; signed as exit 1A (west) and 1B (east)
R0.00 Orange Drive, Nut Tree Road Northbound exit (from I-80 east) and entrance
R0.00 1B Monte Vista Avenue Southbound exit and entrance (to I-80 east)
R1.45 1C Vaca Valley Parkway Signed as exit 1 northbound
R3.08 3 Midway Road
  R5.59 6 Allendale Road
  R10.62 10 Putah Creek Road
YOL 0.00-R22.36
  0.40 11 SR 128 west / CR E6 east – Winters, Davis
  4.03 15 Road 29A
  6.53 17 Road 27
  10.62 21 SR 16 – Woodland, Esparto
  13.43 24 Road 19
  17.45 28 CR E10 (Road 14) – Zamora
  20.13 31 Road 12A
  R22.36 I‑5 north – Redding Northbound exit and southbound entrance
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ "January 1, 2006 California Log of Bridges on State Highways". Retrieved 2013-01-26. 
  2. ^ "CA Codes (shc:250-257)". Retrieved 2013-01-26. 
  3. ^ "California Highways-Routes 1-8". California Highways. Retrieved 2012-09-03. 
  4. ^ a b Staff. "State Truck Route List" (XLS file). California Department of Transportation. Retrieved August 21, 2012. 
  5. ^ California Department of Transportation, Log of Bridges on State Highways, July 2007
  6. ^ California Department of Transportation, All Traffic Volumes on CSHS, 2005 and 2006
  7. ^ California Department of Transportation, California Numbered Exit Uniform System, Interstate 505 Freeway Interchanges, Retrieved on 2009-02-07.

Route map: Google / Bing