Interstate 780

Interstate 780
Interstate 780
	I-780 highlighted in red
Route information
	Auxiliary route of I-80
	Maintained by Caltrans
Length	6.5 mi (10.5 km)
Existed	1973-1976–present
History	State highway in 1935; Interstate (as I-680) in 1955; renumbered I-780 in 1973–76
NHS	Entire route
Major junctions
West end	I-80 in Vallejo
East end	I-680 in Benicia
Location
Country	United States
State	California
Counties	Solano
Highway system
	Interstate Highway System; Main; Auxiliary; Suffixed; Business; Future; State highways in California; Interstate; US; State; Scenic; History; Pre‑1964; Unconstructed; Deleted; Freeways;

Interstate 780 (I-780) is an east–west auxiliary Interstate Highway in the San Francisco Bay Area of Northern California. It runs from the intersection of Curtola Parkway and Lemon Street in Vallejo east to I-680 just north of the Benicia–Martinez Bridge in Benicia. It closely parallels the Carquinez Strait for its entire route. Originally, this segment was part of I-680 before that Interstate was extended and rerouted to Fairfield. The city-maintained Curtola Parkway continues west to State Route 29 (SR 29) in Vallejo.