US Bridges

Oakville Crossroad over Napa River

Good

Napa County, California · 0.5 MI NE of SR 29 · Structure no. 21C0137

Built
2016
9 years old
Condition
Good
inspected August 2021
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
120 ft
2 main spans
Daily traffic
3,000
2016 count
Owner
County
County Highway Agency

About this bridge

Oakville Crossroad over Napa River is a concrete continuous box beam or girders - multiple carrying Oakville Crossroad over Napa River in Napa County, California. It was built in 2016, so it is 9 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,000 vehicles a day, roughly 5% of them trucks, projected to reach 3,673 by 2039. The structure is 120 ft (36.6 m) long and 33 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesOakville Crossroad
CrossesNapa River
Location0.5 MI NE of SR 29
RouteCounty Highway 0
Coordinates38.44092, -122.39494
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 rating46.4 US tons
Inventory rating35.7 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length120 ft (36.6 m)
Longest span60 ft (18.3 m)
Deck width33 ft (10 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,000 (2016)
Projected traffic3,673 by 2039
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Oakville Crossroad over Napa River built?

It was built in 2016, making it 9 years old in 2025.

What condition is Oakville Crossroad over Napa River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2021.

How much traffic does Oakville Crossroad over Napa River carry?

About 3,000 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Oakville Crossroad over Napa River?

The structure is 120 ft (36.6 m) long with a longest span of 60 ft (18.3 m) and a deck 33 ft wide.

Who owns Oakville Crossroad over Napa River?

It is owned by the County Highway Agency.