US Bridges

Soda Cyn RD over Soda Creek

Fair

Napa County, California · 3.1 MI N Silverado Trail · Structure no. 21C0088

Built
1930
95 years old
Condition
Fair
inspected August 2023
Type
Tee Beam
Concrete
Length
28 ft
1 main span
Daily traffic
787
2014 count
Owner
County
County Highway Agency

About this bridge

Soda Cyn RD over Soda Creek is a concrete tee beam carrying Soda Cyn RD over Soda Creek in Napa County, California. It was built in 1930, so it is 95 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 787 vehicles a day, roughly 10% of them trucks, projected to reach 1,015 by 2041. The structure is 28 ft (8.5 m) long and 22 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesSoda Cyn RD
CrossesSoda Creek
Location3.1 MI N Silverado Trail
RouteCounty Highway 0
CountyNapa County
StateCalifornia
Coordinates38.39711, -122.29124
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating31.7 US tons
Inventory rating19 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length28 ft (8.5 m)
Longest span24 ft (7.3 m)
Deck width22 ft (6.7 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic787 (2014)
Projected traffic1,015 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Soda Cyn RD over Soda Creek built?

It was built in 1930, making it 95 years old in 2025.

What condition is Soda Cyn RD over Soda Creek 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 Soda Cyn RD over Soda Creek carry?

About 787 vehicles per day (2014 count), of which roughly 10% are trucks.

How long is Soda Cyn RD over Soda Creek?

The structure is 28 ft (8.5 m) long with a longest span of 24 ft (7.3 m) and a deck 22 ft wide.

Who owns Soda Cyn RD over Soda Creek?

It is owned by the County Highway Agency.