US Bridges

Soscol Ave over Napa River

Fair

Napa County, California · 0.1 MI S First ST · Structure no. 21C0039

Built
1980
45 years old
Condition
Fair
inspected August 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
179 ft
1 main span
Daily traffic
22,690
2017 count
Owner
City
City or Municipal Highway Agency

About this bridge

Soscol Ave over Napa River is a prestressed concrete box beam or girders - multiple carrying Soscol Ave over Napa River in Napa County, California. It was built in 1980, so it is 45 years old, younger 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 6 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 22,690 vehicles a day, roughly 6% of them trucks, projected to reach 30,496 by 2041. The structure is 179 ft (54.5 m) long and 99 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSoscol Ave
CrossesNapa River
Location0.1 MI S First ST
RouteCity Street 0
CountyNapa County
StateCalifornia
Coordinates38.29939, -122.28268
Functional classUrban Other Principal 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating71.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length179 ft (54.5 m)
Longest span178 ft (54.3 m)
Deck width99 ft (30.3 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,690 (2017)
Projected traffic30,496 by 2041
Trucks6%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Soscol Ave over Napa River built?

It was built in 1980, making it 45 years old in 2025.

What condition is Soscol Ave 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 August 2023.

How much traffic does Soscol Ave over Napa River carry?

About 22,690 vehicles per day (2017 count), of which roughly 6% are trucks.

How long is Soscol Ave over Napa River?

The structure is 179 ft (54.5 m) long with a longest span of 178 ft (54.3 m) and a deck 99 ft wide.

Who owns Soscol Ave over Napa River?

It is owned by the City or Municipal Highway Agency.