US Bridges

County Road 12A over Oat Creek

Fair

Yolo County, California · 0.37 MI West of CR #89B · Structure no. 22C0133

Built
1945
80 years old
Condition
Fair
inspected January 2025
Type
Slab
Concrete Continuous
Length
45 ft
2 main spans
Daily traffic
50
2015 count
Owner
County
County Highway Agency

About this bridge

County Road 12A over Oat Creek is a concrete continuous slab carrying County Road 12A over Oat Creek in Yolo County, California. It was built in 1945, so it is 80 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 50 vehicles a day, roughly 20% of them trucks, projected to reach 66 by 2047. The structure is 45 ft (13.7 m) long and 24 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

Location

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CarriesCounty Road 12A
CrossesOat Creek
Location0.37 MI West of CR #89B
RouteCounty Highway 0
CountyYolo County
StateCalifornia
Coordinates38.80208, -121.96296
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.1 US tons
Inventory rating18.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length45 ft (13.7 m)
Longest span21 ft (6.4 m)
Deck width24 ft (7.3 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2015)
Projected traffic66 by 2047
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.7 mi (35 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 12A over Oat Creek built?

It was built in 1945, making it 80 years old in 2025.

What condition is County Road 12A over Oat 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 January 2025.

How much traffic does County Road 12A over Oat Creek carry?

About 50 vehicles per day (2015 count), of which roughly 20% are trucks.

How long is County Road 12A over Oat Creek?

The structure is 45 ft (13.7 m) long with a longest span of 21 ft (6.4 m) and a deck 24 ft wide.

Who owns County Road 12A over Oat Creek?

It is owned by the County Highway Agency.