Interstate 780 California

Interstate 780 California
Curtola Parkway – Vallejo, CA ↔ Benicia, CA•6.50 miles

Overview

Interstate 780 is a four lane freeway joining the cities of Vallejo and Benicia along a parallel alignment to Carquinez Strait in Solano County. The end of I-780 at Lemon Street ties into Curtola Parkway, a four lane arterial spurring west to California State Route 29 (Sonoma Boulevard) near Downtown Vallejo.

Mileage by State

California7.03 mi

Data Sources

December 31, 2025 Interstate Route Log and Finders List

History

The link between I-80/680 was created in 1976,1 when I-680 was rerouted northward from Benicia to Fairfield over the freeway on California State Route 21 to I-80. The freeway mainline dates back to 1962, with the I-80 bridges at the west end built in 1958.

East End Interstate 680 ‐ Benicia, CA

Interstate 780 East at Interstate 680

I-780 east at I-680 - Benicia, CA

I-780 arcs one mile eastward from the diamond interchange (Exit 6) with E Fifth Street in Benicia to Interstate 680 at the north end of the Benicia-Martinez Bridge over the Sacramento/San Joaquin River Delta. 07/17/09

I-780 east at I-680 - Benicia, CA I-780 east at I-680 - Benicia, CA I-780 east at I-680 - Benicia, CA

Interstate 680 North at Interstate 780

I-680/Benicia-Martinez Bridge north at I-780

Constructed between late 2001 and August 2007, the Benicia-Martinez Bridge spans the Sacramento and San Joaquin Delta, which is also known as the Carquinez Straits and Suisun Bay. The concrete segmental bridge accommodates five lanes of northbound traffic for I-680 to the left exit with Interstate 780. 07/05/13

I-680/Benicia-Martinez Bridge north at I-780 I-680/Benicia-Martinez Bridge north at I-780 I-680/Benicia-Martinez Bridge north at I-780

Interstate 680 South at Interstate 780

I-680 south at I-780 - Benicia, CA

Interstate 680 crosses a long viaduct above Bayshore Road and industrial areas west Suisun Bay leading to I-780. 07/11/18

I-680 south at I-780 - Benicia, CA I-680 south at I-780 - Benicia, CA I-680 south at I-780 - Benicia, CA I-680 south at I-780 - Benicia, CA

East End – Past Views

Past Views Gallery (Tap to Expand / Collapse Section)

Interstate 780 at Interstate 680

I-780 east at I-680 - 2004

This button copy sign along I-780 east at Fifth Street pre-dated the conversion of SR 21 to I-680 through Benecia, with an outline for I-680 overlaying a shield for the previous state route. This style of overhead sign was common along I-680 prior to its reconstruction through Concord and Walnut Creek in the 1990s. 11/26/04

I-780 east at I-680 - 2004 I-680 south at I-780 - 2003 I-680 north at I-780 - 2004 I-680 north at I-780 - 2004 I-680 north at I-780 - 2004

West End Interstate 80 ‐ Curtola Parkway – Vallejo, CA

Interstate 780 West at Interstate 80 Curtola Parkway

I-780 west at I-80 - Vallejo, CA

Replaced button copy sign for Interstate 80 at the diamond interchange (Exit 13) with Glen Cove Road. 02/19/12

I-780 west at I-80 - Vallejo, CA Interchange sequence sign 0.75 miles ahead of I-80 on I-780 west I-780 west at Cedar St, a half mile ahead of I-80 east I-780 west at Exit 1 B for I-80 east to Sacramento, CA I-780 west at Exit 1 A to I-80 west I-780 west transitions onto Curtola Parkway I-780 west at Curtola Pkwy - Vallejo, CA

Curtola Parkway East at Interstate 80 Interstate 780

Curtola Pkwy east becomes I-780 at I-80.

Curtola Parkway east transitions to Interstate 780 beyond the traffic light at Lemon Street. The freeway quickly meets Exit 1 A for I-80 west to Oakland and San Francisco. 07/15/23

Curtola Pkwy east becomes I-780 at I-80. I-780 east at I-80 east

Interstate 80 East at Interstate 780

I-80 east at Magazine St, a half mile ahead of I-780

The first of two guide signs along Interstate 80 east for I-780 appears at the compact folded diamond interchange (Exit 29 C) with Lincoln Road east at Magazine Street. 07/15/23

I-80 east at Magazine St, a half mile ahead of I-780 I-80 east at the c/d roadway for I-780 and Curtola Pkwy

Interstate 80 West at Interstate 780

I-80 west at I-780 - Vallejo, CA

Passing through a substandard parclo B2 interchange with 14th and Georgia Streets, motorists on Interstate 80 west next approach the c/d roadway (Exit 30A) for I-780 east and Curtola Parkway west. 07/02/13

I-80 west at I-780 - Vallejo, CA I-80 west at I-780 - Vallejo, CA

West End – Past Views

Past Views Gallery (Tap to Expand / Collapse Section)

Interstate 780 at Interstate 80

Curtola Pkwy east at I-780/80 - 2004

The previous button copy signs along Curtola Parkway east at I-780 and I-80 east. 11/26/04

Curtola Pkwy east at I-780/80 - 2004 I-780 east at Exit 1 B for I-80 east in 2015 I-780 west at I-80 in 2012 I-80 east at Magazine St and ahead of I-780 in 2009. I-780 west at I-80 west in 2012

References

  1. Faigin, D. (2016, January 1). Route 780. California Highways. Retrieved from https://www.cahighways.org/ROUTE780.html
Updated October 3, 2023