US Bridges

Center RD over Willow Creek

Fair

Lassen County, California · Just East of Belfast RD · Structure no. 07C0037

Built
1975
50 years old
Condition
Fair
inspected August 2024
Type
Tee Beam
Concrete Continuous
Length
97 ft
2 main spans
Daily traffic
600
1980 count
Owner
County
County Highway Agency

About this bridge

Center RD over Willow Creek is a concrete continuous tee beam carrying Center RD over Willow Creek in Lassen County, California. It was built in 1975, so it is 50 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 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 600 vehicles a day, roughly 10% of them trucks, projected to reach 998 by 2046. The structure is 97 ft (29.7 m) long and 32 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesCenter RD
CrossesWillow Creek
LocationJust East of Belfast RD
RouteCounty Highway 0
CountyLassen County
StateCalifornia
Coordinates40.40049, -120.45045
Functional classRural Major Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.1 US tons
Inventory rating23.9 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length97 ft (29.7 m)
Longest span48 ft (14.6 m)
Deck width32 ft (9.9 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic600 (1980)
Projected traffic998 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 Center RD over Willow Creek built?

It was built in 1975, making it 50 years old in 2025.

What condition is Center RD 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 August 2024.

How much traffic does Center RD over Willow Creek carry?

About 600 vehicles per day (1980 count), of which roughly 10% are trucks.

How long is Center RD over Willow Creek?

The structure is 97 ft (29.7 m) long with a longest span of 48 ft (14.6 m) and a deck 32 ft wide.

Who owns Center RD over Willow Creek?

It is owned by the County Highway Agency.