Interstate 780

Interstate 780
I-780 highlighted in red
Route information
Auxiliary route of I-80
Maintained by Caltrans
Length	6.5 mi[1] (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	Curtola Pkwy & Lemon St in Vallejo
Major intersections	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
← I-710 → I-805

Interstate 780 (I-780) is an east–west auxiliary Interstate Highway in the San Francisco Bay Area of Northern California. It runs from Curtola Parkway and Lemon Street in Vallejo 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 from I-80 to State Route 29 (SR 29) in Vallejo.