US Bridges

County Road 12A over Oat Creek

Fair

Yolo County, California · 0.34 MI East of CR #87 · Structure no. 22C0132

Built
1940
85 years old
Condition
Fair
inspected January 2025
Type
Slab
Concrete Continuous
Length
49 ft
2 main spans
Daily traffic
494
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 1940, so it is 85 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 494 vehicles a day, roughly 10% of them trucks, projected to reach 624 by 2047. The structure is 49 ft (14.8 m) long and 27 ft wide. If it were closed, the detour would be 10.6 mi (17 km).

Location

Open in Google Maps
CarriesCounty Road 12A
CrossesOat Creek
Location0.34 MI East of CR #87
RouteCounty Highway 0
CountyYolo County
StateCalifornia
Coordinates38.80434, -122.00116
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.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating31.7 US tons
Inventory rating19 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length49 ft (14.8 m)
Longest span24 ft (7.3 m)
Deck width27 ft (8.2 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic494 (2015)
Projected traffic624 by 2047
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed10.6 mi (17 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 1940, making it 85 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 494 vehicles per day (2015 count), of which roughly 10% are trucks.

How long is County Road 12A over Oat Creek?

The structure is 49 ft (14.8 m) long with a longest span of 24 ft (7.3 m) and a deck 27 ft wide.

Who owns County Road 12A over Oat Creek?

It is owned by the County Highway Agency.