US Bridges

County Road 99W over Oat Creek

Fair

Yolo County, California · 0.29 MI NW of CR 91B · Structure no. 22C0047

Built
1919
106 years old, rebuilt 1949
Condition
Fair
inspected January 2025
Type
Tee Beam
Concrete
Length
32 ft
1 main span
Daily traffic
1,460
2015 count
Owner
County
County Highway Agency

About this bridge

County Road 99W over Oat Creek is a concrete tee beam carrying County Road 99W over Oat Creek in Yolo County, California. It was built in 1919 and reconstructed in 1949, so it is 106 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 1,460 vehicles a day, roughly 6% of them trucks, projected to reach 1,738 by 2047. The structure is 32 ft (9.7 m) long and 44 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesCounty Road 99W
CrossesOat Creek
Location0.29 MI NW of CR 91B
RouteCounty Highway 0
CountyYolo County
StateCalifornia
Coordinates38.8417, -121.9272
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.5 US tons
Inventory rating17.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length32 ft (9.7 m)
Longest span29 ft (8.8 m)
Deck width44 ft (13.5 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,460 (2015)
Projected traffic1,738 by 2047
Trucks6%
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 99W over Oat Creek built?

It was built in 1919, making it 106 years old in 2025. It was reconstructed in 1949.

What condition is County Road 99W 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 99W over Oat Creek carry?

About 1,460 vehicles per day (2015 count), of which roughly 6% are trucks.

How long is County Road 99W over Oat Creek?

The structure is 32 ft (9.7 m) long with a longest span of 29 ft (8.8 m) and a deck 44 ft wide.

Who owns County Road 99W over Oat Creek?

It is owned by the County Highway Agency.