US Bridges

Greenwood Ave over Napa River

Good

Napa County, California · .2 MI Sw/O Myrtledale RD · Structure no. 21C0138

Built
2015
10 years old
Condition
Good
inspected August 2021
Type
Slab
Prestressed Concrete
Length
74 ft
1 main span
Daily traffic
386
2008 count
Owner
County
County Highway Agency

About this bridge

Greenwood Ave over Napa River is a prestressed concrete slab carrying Greenwood Ave over Napa River in Napa County, California. It was built in 2015, so it is 10 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 386 vehicles a day, roughly 10% of them trucks, projected to reach 635 by 2038. The structure is 74 ft (22.7 m) long and 24 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesGreenwood Ave
CrossesNapa River
Location.2 MI Sw/O Myrtledale RD
RouteCounty Highway 0
CountyNapa County
StateCalifornia
Coordinates38.589, -122.59778
Functional classRural Minor Arterial

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 protection9 ExcellentNo 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length74 ft (22.7 m)
Longest span74 ft (22.7 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic386 (2008)
Projected traffic635 by 2038
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Greenwood Ave over Napa River built?

It was built in 2015, making it 10 years old in 2025.

What condition is Greenwood Ave 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 Greenwood Ave over Napa River carry?

About 386 vehicles per day (2008 count), of which roughly 10% are trucks.

How long is Greenwood Ave over Napa River?

The structure is 74 ft (22.7 m) long with a longest span of 74 ft (22.7 m) and a deck 24 ft wide.

Who owns Greenwood Ave over Napa River?

It is owned by the County Highway Agency.