US Bridges

CO RD 133C over Willow Creek

Fair

Modoc County, California · 0.1 MI S of CR 9 · Structure no. 03C0031

Built
1987
38 years old
Condition
Fair
inspected April 2023
Type
Culvert
Concrete
Length
30 ft
3 main spans
Daily traffic
20
2012 count
Owner
County
County Highway Agency

About this bridge

CO RD 133C over Willow Creek is a concrete culvert carrying CO RD 133C over Willow Creek in Modoc County, California. It was built in 1987, so it is 38 years old, younger 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 6 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 20 vehicles a day, projected to reach 38 by 2045. The structure is 30 ft (9.1 m) long and 26 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

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CarriesCO RD 133C
CrossesWillow Creek
Location0.1 MI S of CR 9
RouteCounty Highway 0
CountyModoc County
StateCalifornia
Coordinates41.87433, -120.30302
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length30 ft (9.1 m)
Longest span9 ft (2.7 m)
Deck width26 ft (8 m)
Roadway width26 ft (7.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2012)
Projected traffic38 by 2045
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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 CO RD 133C over Willow Creek built?

It was built in 1987, making it 38 years old in 2025.

What condition is CO RD 133C over Willow 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 April 2023.

How much traffic does CO RD 133C over Willow Creek carry?

About 20 vehicles per day (2012 count).

How long is CO RD 133C over Willow Creek?

The structure is 30 ft (9.1 m) long with a longest span of 9 ft (2.7 m) and a deck 26 ft wide.

Who owns CO RD 133C over Willow Creek?

It is owned by the County Highway Agency.