Interstate 505

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

Interstate 505
Route information
Defined by S&HC § 617
Maintained by Caltrans
Length:	32.99 mi (53.09 km)
Existed:	1977 – present
Major junctions
South end:	I-80 in Vacaville
North end:	I-5 near Dunnigan
Highway system
Auxiliary route of the Interstate Highway System Main • Auxiliary • Business State highways in California(list • pre-1964) History • Unconstructed • Deleted • Freeway • Scenic ← I-405 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.

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

Route description

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.

Exit list

Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, and do not necessarily reflect current mileage. The numbers reset at county lines; the start and end postmiles in each county are given in the county column.

County	Location	Postmile	Exit	Destinations	Notes
Solano SOL R0.00-R10.63	Vacaville	R0.00	1	I-80 – San Francisco, Sacramento	Southbound exit and northbound entrance; signed as exits 1A (west) and 1B (east)
		R0.00	1B	Monte Vista Avenue	Southbound exit and northbound entrance
		R1.45	1C	Vaca Valley Parkway	Signed as exit 1 northbound
		R3.08	3	Midway Road
		R5.59	6	Allendale Road
Solano–Yolo county line		R10.62	10	Putah Creek Road
Yolo 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	Road 14 (CR E10) – 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      Concurrency terminus •      Closed/former •      Incomplete access •      Unopened