US Bridges

Old HWY 99 W over Oat Creek

Good

Tehama County, California · 0.1 MI N of Flores Ave · Structure no. 08C0115

Built
1940
85 years old
Condition
Good
inspected February 2024
Type
Slab
Concrete Continuous
Length
140 ft
7 main spans
Daily traffic
4,000
2006 count
Owner
County
County Highway Agency

About this bridge

Old HWY 99 W over Oat Creek is a concrete continuous slab carrying Old HWY 99 W over Oat Creek in Tehama 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,000 vehicles a day, roughly 2% of them trucks, projected to reach 6,586 by 2046. The structure is 140 ft (42.7 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesOld HWY 99 W
CrossesOat Creek
Location0.1 MI N of Flores Ave
RouteCounty Highway 0
Coordinates40.08395, -122.17246
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.5 US tons
Inventory rating20.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadH 15
Structure length140 ft (42.7 m)
Longest span26 ft (7.8 m)
Deck width31 ft (9.6 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,000 (2006)
Projected traffic6,586 by 2046
Trucks2%
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 Old HWY 99 W over Oat Creek built?

It was built in 1940, making it 85 years old in 2025.

What condition is Old HWY 99 W over Oat Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2024.

How much traffic does Old HWY 99 W over Oat Creek carry?

About 4,000 vehicles per day (2006 count), of which roughly 2% are trucks.

How long is Old HWY 99 W over Oat Creek?

The structure is 140 ft (42.7 m) long with a longest span of 26 ft (7.8 m) and a deck 31 ft wide.

Who owns Old HWY 99 W over Oat Creek?

It is owned by the County Highway Agency.