US Bridges

G Street over Napa River

Fair

Solano County, California · 1 Mile West of SR 29 · Structure no. 23C0248

Built
1934
91 years old, rebuilt 1980
Condition
Fair
inspected March 2024
Type
Movable - Lift
Steel
Length
2,006 ft
1 main span
Daily traffic
5,743
2008 count
Owner
City
City or Municipal Highway Agency

About this bridge

G Street over Napa River is a steel movable - lift carrying G Street over Napa River in Solano County, California. It was built in 1934 and reconstructed in 1980, so it is 91 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 5,743 vehicles a day, roughly 10% of them trucks, projected to reach 10,408 by 2042. The structure is 2,006 ft (611.3 m) long and 38 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesG Street
CrossesNapa River
Location1 Mile West of SR 29
RouteCity Street 0
Coordinates38.10964, -122.2776
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating35.4 US tons

Structure

Structure typeMovable - Lift
MaterialSteel
DeckOpen grating
Main spans1 (+51 approach)
Design loadUnknown
Structure length2,006 ft (611.3 m)
Longest span165 ft (50.3 m)
Deck width38 ft (11.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deck22 ft (6.7 m)

Traffic and service

Average daily traffic5,743 (2008)
Projected traffic10,408 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and railroad
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was G Street over Napa River built?

It was built in 1934, making it 91 years old in 2025. It was reconstructed in 1980.

What condition is G Street over Napa River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in March 2024.

How much traffic does G Street over Napa River carry?

About 5,743 vehicles per day (2008 count), of which roughly 10% are trucks.

How long is G Street over Napa River?

The structure is 2,006 ft (611.3 m) long with a longest span of 165 ft (50.3 m) and a deck 38 ft wide.

Who owns G Street over Napa River?

It is owned by the City or Municipal Highway Agency.