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.
^"Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. December 31, 2021. Retrieved July 13, 2022.
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