Interstate 780


Routing

Interstate 780 is a short freeway route connecting Interstate 80 in Vallejo with Interstate 680 in Benicia.

History

Until 1976, the freeway carrying Interstate 780 was signed as part of Interstate 680. In that year, Interstate 680 was transferred to the old California 21 alignment from Benicia north to Fairfield, and Interstate 780 was created along old Interstate 680 from Benicia to Vallejo.

Highway Guides

Interstate 780 east
Leaving Vallejo on eastbound Curtola Parkway (former California 141), the parkway changes into a freeway configuration after passing the Lemon Street traffic signal. The first interchange is a cloverleaf with Interstate 80. The first ramp connects Interstate 780 east (south) with Interstate 80 west (south) to the Alfred Zampa (Carquinez) Bridge, Richmond, Oakland, and San Francisco. The next exit is Exit 1B, Junction Interstate 80 east (north) to north Vallejo, Fairfield, and Sacramento. Note the use of a butterfly gantry sign bridge with porcelain signs that likely date to the late 1960s. Photo taken 11/26/04.
Passing under the mainline of Interstate 80, the next ramp connects Interstate 780 east with Interstate 80 east via a loop ramp. An exit number tab for Exit 1B was added to the existing sign panel between 2004 and 2013 (not shown). Photos taken 11/26/04 and 07/06/13.
Look for a sharp turn from Interstate 780 east to Interstate 80 east (loop ramp of the cloverleaf interchange). Photo taken 07/06/13.
The next exit along eastbound Interstate 780 is Exit 1C, Laurel Street north to Steffan Street and south to Magazine Street in Vallejo. Photos taken 07/06/13 and 11/26/04.
After the on-ramp from Laurel Street, this Interstate 780 east shield assembly is posted on the mainline. Most of Interstate 780 carries only two lanes in each direction. Photo taken 07/06/13.
A pedestrian bridge spans Interstate 780 as the freeway approaches Exit 1D, Glen Cove Road (one-half mile). Photos taken 07/06/13.
An oleander-lined median follows Interstate 780 between Exits 1C and Exit 1D. Photos taken 07/06/13.

Eastbound Interstate 780 reaches Exit 1D, Glen Cove Road. An exit number sign greets us at this offramp. This interchange is a diamond interchange, the first of its kind along eastbound. This exit sign was converted to an overhead sign by 2013. Photos taken 07/06/13 and 11/26/04.
An Interstate 780 east reassurance shield is posted after the onramp from Exit 1D. Photo taken 11/26/04.
After the Glen Cove Road interchange, Interstate 780 swings a bit to the southeast. While the freeway generally remains in Vallejo, it also enters some unincorporated areas before it finally enters Benicia. Photo taken 11/26/04.
This mileage sign provides the distance to Benicia (three miles) and the Interstate 680 south control city of San Jose (61 miles). Photos taken 07/06/13 and 11/26/04.
The next exit along eastbound Interstate 780 is Exit 3A, Columbus Parkway. This interchange also connects to Rose Drive and is located within Benicia State Recreation Area. Photos taken 07/06/13 and 11/26/04.
Use Exit 3A to Benicia State Recreation Area, which is signed here as a state park. Hikers, RV campers, and fishermen enjoy this park, with its view of the Carquinez Strait. Photos taken 07/06/13 and 11/26/04.
Eastbound Interstate 780 reaches Exit 3A, Columbus Parkway and Rose Drive to Benicia State Recreation Area. This sign was also elevated onto a sign bridge between 2004 and 2013. Photos taken 07/06/13 and 11/26/04.
The next exit along Interstate 780 east is Exit 3B, Military West. Photo taken 11/26/04.
The next four exits along eastbound Interstate 780 all serve the city of Benicia: Exit 3B, Military West; Exit 4, Southampton Road; Exit 5, East Second Street; and Exit 6, East Fifth Street. Upon entering the state recreation area, Interstate 780 leaves Vallejo and enters Benicia, which was home to 26,997 people as of the 2010 Census and was incorporated on March 27, 1850. The city briefly served as the capital of the state of California, from February 11, 1853, through February 25, 1854, until the capital was permanently moved to Sacramento. Photo taken 07/06/13.
For the Benicia industrial park, use Interstate 780 east to Interstate 680 north to Exit 58B, Bayshore Road. A new flyover ramp makes this connection easy for trucks and other cargo haulers. Photo taken 11/26/04.
Eastbound Interstate 780 reaches Exit 3B, Military West and K Street. This is the beginning of the main business route into Benicia, with the return to the freeway at Exit 6, East Fifth Street. Photos taken 07/06/13 and 11/26/04.
An Interstate 780 east reassurance shield is posted shortly after the onramp from Military West. The next interchange will be Exit 4, Southampton Road and West Seventh Street. Photo taken 11/26/04.
Eastbound Interstate 780 meets Exit 4, Southampton Road and West Seventh Street. Southampton Road parallels Interstate 780 on the north side of the freeway between Exits 3B and 4. This sign was replaced to include the exit number between 2004 and 2013. Photos taken 07/06/13 and 11/26/04.
The next exit along eastbound Interstate 780 is Exit 5, East Second Street to downtown Benicia. Photos taken 07/06/13 and 11/26/04.
Interstate 780 ascends a hill and enters historic Benicia. Photos taken 07/06/13.
The next exit along Interstate 780 east is Exit 5, East Second Street to downtown Benicia. Photo taken 07/06/13.
Eastbound Interstate 780 reaches Exit 5, East Second Street to downtown Benicia, including the old Benicia Capitol building, Municipal Pier, Turnbull Park, and Benicia Marina. Photos taken 07/06/13 and 11/26/04.
A view of the Benicia-Martinez Bridge can be seen at a Vista Point accessed via Interstate 680. The vista point is located in a prime viewing location of the Interstate 680 bridges, but it is found via a convoluted route on local streets. Take Interstate 680 north to Exit 58B, Bayshore Road, turn left (north), then turn left (south) on Park Road. The path to the Vista Point is well signed but involves some backtracking to see the view. Photo taken 07/06/13.
The penultimate exit on Interstate 780 east is Exit 6, East Fifth Street in Benicia. Use this exit to the Benicia Arsenal The next exit is the eastern terminus of Interstate 780 at the interchange with Interstate 680 at the northern end of the Benicia-Martinez Bridge over Suisun Bay. Photo taken 11/26/04.
Eastbound Interstate 780 reaches Exit 6, East Fifth Street in Benicia. On the overhead signage, note that the northbound Interstate 680 shield (left exit) is green and was placed over a California 21 shield that was scraped off. More signs like this one used to found all along Interstate 680 through Contra Costa County, but they were completely removed with the reconstruction of the route between Concord and Dublin. Photos taken 07/06/13 and 11/26/04.
After the East Fifth Street interchange, Interstate 780 prepares to interchange with Interstate 680. The left two lanes connect to Interstate 680 south to Martinez, Concord, and Walnut Creek. The right lane connects to the Benicia Industrial Park, Fairfield, and Sacramento. Photo taken 11/26/04.
Interstate 780 ends as the freeway splits. The right lane connects to Interstate 680 north, and the left two lanes connect to Interstate 680/Benicia-Martinez Bridge south to Martinez and San Jose. There is no END Interstate 780 shield assembly. Photo taken 11/26/04.
After Exit 7A departs, the remaining through lanes of Interstate 780 are defaulted onto Interstate 680 south. The ramp to Interstate 680 north crosses over the main lanes, and this image shows the remains of the original ramp from Interstate 780 east to Interstate 680 north. This connection made it difficult for trucks to merge over to the Benicia Industrial Park interchange (Exit 58B, Bayshore Road). Photo taken 11/26/04.
The two left lanes of Interstate 780 become the two right lanes of Interstate 680 south on the Benicia-Martinez Bridge. The old toll booth, which is no longer in use, comes into view as the two freeways merge together. There is no toll on Interstate 680 south over the Carquinez Strait/Suisun Bay. The original Benicia-Martinez Bridge was opened to traffic on September 15, 1962 (George Miller, Jr. Bridge, deck truss span, 1.2 miles); the new span opened on August 25, 2007 (segmented concrete span, George Miller III Bridge, 1.7 miles). A Union Pacific railroad lift bridge sits between the two spans; it was built in 1929-1930. As part of a project to expand the Benicia-Martinez Bridge to include a new northbound span, this picture shows the massive bridge deck being installed. Pillars for the new bridge were being placed at the time this photo was taken. Upon completion, Interstate 680 over the delta was brought up to Interstate standards, including full shoulders. Photo taken 11/26/04.
Interstate 780 west
Two ramps connect Interstate 680 with Interstate 780 west near the city of Benicia. The first, shown here, connects Interstate 680 north with Interstate 780 west. Two lanes make the connection from northbound to westbound. A separate ramp connects Interstate 680 south with Interstate 780 west. Photos taken 07/05/13.
Leaving the split from Interstate 680 north, westbound Interstate 780 begins with two lanes. The next onramp brings traffic from Interstate 680 south onto Interstate 780 west. Photo taken 07/05/13.
Traffic from Interstate 680 south joins Interstate 780 west. Photo taken 07/05/13.
The first four exits along Interstate 780 west serve the city of Benicia, which was home to 26,997 people as of the 2010 Census and was incorporated on March 27, 1850. The city briefly served as the capital of the state of California, from February 11, 1853 through February 25, 1854 until the capital was permanently moved to Sacramento. Photo taken 07/05/13.
A mileage sign provides the distance to the next three exits along Interstate 780 west: Exit 6, East Fifth Street; Exit 5, East Second Street; and Exit 4, Southampton Road. Photo taken 07/05/13.
Initially, Interstate 780 parallels and looks down on the Carquinez Straits (Sacramento-San Joaquin Delta). The freeway then turns inland to bypass Benicia and curve toward Vallejo. Photos taken 07/05/13.
Prior to a sign replacement project on Interstate 780, this advance guide sign was posted one-half mile prior to the first exit along Interstate 780 west for Exit 6, East Fifth Street. The mileage sign shown in the previous photobox is roughly in the same location as this old sign was. Photo taken 12/30/01.
Westbound Interstate 780 meets Exit 6, East Fifth Street in Benicia. The next exit is Exit 5, East Second Street. The exit sign was relocated to a point prior to the offramp to meet modern highway standards (and thus eliminating the "butterfly gantry" sign bridge that preceded it). Photos taken 07/05/13 and 12/30/01.
Interstate 780 passes through the East Fifth Street interchange in Benicia. Colorful oleander lines the median. Photos taken 07/05/13.
An Interstate 780 west reassurance shield is posted shortly after the onramp from East Fifth Street. The route marker was replaced between 2012 and 2013 (notice the variation in shield shape between old and new). Photos taken 07/05/13 and 02/19/12.
Quickly thereafter, Interstate 780 west meets Exit 5, East Second Street in Benicia. The following exit is for Exit 4, Southampton Road. Both guide signs now feature the exit number. Photo taken 07/05/13.
Exit 5 acts like a diamond interchange for westbound traffic (not so for eastbound); a traffic signal awaits at the bottom of the offramp. Photo taken 02/19/12.
Before its removal, another butterfly gantry sign bridge used to mark the gore point for Exit 5. Photo taken 12/30/01.
Interstate 780 passes through the East Second Street interchange (Exit 5). Photo taken 07/05/13.
An Interstate 780 reassurance route marker is posted shortly after the onramp from East Second Street. Photo taken 07/05/13.
The freeway continues west between Exits 5 and 4. Photo taken 07/05/13.
Continuing along the four-lane freeway, westbound Interstate 780 next meets Exit 4, Southampton Road. Photo taken 07/05/13.
The next exit along Interstate 780 west is Exit 3B, Military West (one mile). This is the primary route through downtown Benicia and travels southeast through Benicia. Photo taken 11/26/11.
An Interstate 780 west reassurance route marker is posted after the onramp from Southampton Road. Photo taken 07/05/13.
Interstate 780 briefly gains elevation then descends. Photo taken 07/05/13.
The freeway curves a bit just before the offramp to Military West. Photo taken 07/05/13.
Westbound Interstate 780 meets Exit 3B, Military West, the final Benicia interchange. The next exit is Exit 3A, Columbus Parkway. Photo taken 07/05/13.
A loop ramp departs the freeway for Exit 3B. Photo taken 07/05/13.
An Interstate 780 west reassurance route marker is posted after the onramp from Military West. Photo taken 07/05/13.
The next interchange along Interstate 780 west is Exit 3A, Columbus Parkway. To the Benicia State Recreation Area, which is signed here as a state park, use Exit 3A. Hikers, RV campers, and fishermen enjoy this park, with its view of the Carquinez Strait. Photo taken 07/05/13.
Westbound Interstate 780 meets Exit 3A, Columbus Parkway to Benicia State Recreation Area. The next interchange along westbound is Exit 1D, Glen Cove Road (1.25 miles). Photo taken 07/05/13.
An Interstate 780 west shield is posted between Columbus Parkway and Glen Cove Road. Photo taken 02/19/12.
Interstate 780 passes under Rose Drive. Photo taken 07/05/13.
The next exit along Interstate 780 west is Exit 1D, Glen Cove Road (one mile). Photo taken 07/05/13.
This sign welcomes Interstate 780 westbound travelers to the city of Vallejo (incorporated on March 30, 1868, and population of 115,942 as of the 2010 Census). Photo taken 07/05/13.
Westbound Interstate 780 meets Exit 1D, Glen Cove Road. The next exit along Interstate 780 west is Exit 1C, Cedar Street (0.75 mile). Photo taken 07/05/13.
Exit 1D (Glen Cove Road interchange) is a diamond interchange. Photo taken 07/05/13.
An advance sign also mentions the final interchange along Interstate 780 west, which is Exits 1A-B, Junction Interstate 80 east to Sacramento and west to Oakland and San Francisco. The main lanes of Interstate 780 directly link to Curtola Parkway after passing through the Interstate 80 interchange. Photo taken 07/05/13.
An Interstate 780 west reassurance shield is posted shortly after the onramp from Exit 1D. Photo taken 07/05/13.
This mileage sign provides the distance to the final four exits along Interstate 780 west: Exit 1C, Cedar Street; Exit 1B, Junction Interstate 80 east to Sacramento; Exit 1A, Junction Interstate 80 west to Oakland and San Francisco; and Exit 0, Curtola Parkway to Lemon Street (traffic signal). Photo taken 07/05/13.
Watch for a sub-standard vertical clearance (14'10") in 2,070 feet (at the Interstate 80 cloverleaf interchange). Photo taken 07/05/13.
To California 37 west to Marine World and San Rafael, use Exit 1B, Junction Interstate 80 east (Interstate 80 generally travels north-south through here). California 37 also offers the best, high-speed connection to California 29 north, although that connection can also be made via Curtola Parkway (a surface street). Use California 37 west to the U.S. 101 corridor north to Santa Rosa and Eureka. Photo taken 07/05/13.
For Vallejo tourist information, follow Curtola Parkway northwest of the Interstate 80 interchange. Photo taken 07/05/13.
Westbound Interstate 780 reaches Exit 1C, Cedar Street. The final interchange will be the junction with Interstate 80, with the first ramp connecting to Exit 1B, Junction Interstate 80 east to Sacramento and the second ramp connecting to Exit 1A, Junction Interstate 80 west to Oakland and San Francisco. Non-exiting traffic are defaulted onto westbound Curtola Parkway, which connects to Lemon Street and eventually California 29/Sonoma Boulevard. Photo taken 07/05/13.
Shortly thereafter, westbound Interstate 780 enters the cloverleaf interchange with Interstate 80 and meets Exit 1B, Junction Interstate 80 east to Sacramento. The second ramp connects to Exit 1A, Junction Interstate 80 west. The signs were changed to include the exit number. Photos taken 02/19/12, 07/05/13, and 12/30/01.
The connecting ramp from Interstate 780 west to Interstate 80 east (north) is fairly sharp. Use Interstate 80 east to the California 37 interchange for California 37 west to San Rafael, Marine World, and California 29 north en route to Napa and Sonoma. Photo taken 07/05/13.
Continuing into the cloverleaf interchange, westbound Interstate 780 next connects with Interstate 80 west at Exit 1A. It is surprising to see a cloverleaf interchange here since it connects two Interstate highways; most freeway-to-freeway interchanges in the Bay Area tend to have at least one flyover ramp to eliminate merging difficulties commonly found at cloverleaf interchanges. This interchange marks the western terminus of Interstate 780, although no END shield is posted here. Photo taken 07/05/13.
Passing under mainline Interstate 80, westbound Interstate 780 meets Exit 1A, Junction Interstate 80 west (south) to Oakland and San Francisco at this cloverleaf interchange. Photo taken 02/19/12.
The connection from Interstate 780 west to Interstate 80 west follows a slow loop ramp. Proceed ahead to follow Curtola Parkway (former California 141) west into downtown Vallejo. Photo taken 02/19/12.
Traffic from Interstate 80 east merges onto Curtola Parkway west. Photo taken 02/19/12.
After the junction with Interstate 80 in Vallejo, Interstate 780 ends and Curtola Parkway continues straight ahead along what was formerly designated as California 141 (between Interstate 80 and California 29). The freeway ends at this traffic light with Lemon Avenue; the road continues straight ahead as Curtola Parkway, which leads west to meet California 29 (Sonoma Boulevard). Beyond California 29, the roadway continues as Mare Island Way and Wilson Avenue to connect to the ferry docks, Vallejo marina, Mare Island (a former naval facility), and finally Junction California 37 (Sears Point). Photo taken 02/19/02.
The freeway ends at the signalized intersection with Lemon Street. Photo taken 02/19/12.
Curtola Parkway (former California 141) west
Curtola Parkway, which was signed as California 141 between 1964 and 1988, extends between Lemon Street just west of the Interstate 80-780 interchange and California 29/Sonoma Boulevard in downtown Vallejo. Photo taken 02/19/12.
A wood/concrete pedestrian bridge spans Curtola Parkway between Lemon Street and Solano Avenue. It connects Wilson Lake Dalwigk Park with Lake Dalwigk Park. Both sites have walking paths that connect to the bridge; the sites are managed by the Greater Vallejo Recreation District. Photo taken 02/19/12.
Westbound Curtola Parkway approaches Solano Avenue. Photo taken 02/19/12.
Not long after that, westbound Curtola Parkway meets California 29/Sonoma Boulevard at this traffic signal. Turn left for California 29 south to Interstate 80 en route to Richmond and Oakland or turn right for California 29 north to the communities of Napa Valley (Napa, Yountville, St. Helena, Calistoga) and Lake County (Middletown, Clearlake, Kelseyville, and Lakeport). Photo taken 02/19/12.
Scenes Pertaining to Interstate 780
This Interstate 780-80 trailblazer shield assembly is located on westbound Lemon Street at Curtola Parkway in an unincorporated area mostly surrounded by Vallejo in the immediate vicinity of the Interstate 80-780 cloverleaf interchange. Photo taken 11/26/04.
Signage for eastbound Interstate 780 as seen from East Main Street in Benicia (Exit 6). Note that Interstate 780 leads to both Sacramento and San Jose according to the guide sign, which is due to the fact that Interstate 780 terminates at Interstate 680 a mile or so east of here. Photo taken 12/30/01.
This freeway entrance shield assembly for Interstate 780 west is posted at the East Main Street interchange in Benicia (Exit 6). Although many of the mainline shields for Interstate 780 are narrow, most of the freeway entrance shields (such as these) have normal specifications for a three-digit Interstate shield. Photos taken 12/30/01.

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Page Updated September 15, 2013.

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