US Bridges

County Road 303 over Clarks Valley Creek

Fair

Glenn County, California · 1.5 MI N RD 400 · Structure no. 11C0159

Built
1935
90 years old
Condition
Fair
inspected August 2023
Type
Girder and Floorbeam System
Concrete
Length
32 ft
1 main span
Daily traffic
27
2011 count
Owner
County
County Highway Agency

About this bridge

County Road 303 over Clarks Valley Creek is a concrete girder and floorbeam system carrying County Road 303 over Clarks Valley Creek in Glenn County, California. It was built in 1935, so it is 90 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 27 vehicles a day, projected to reach 35 by 2043. The structure is 32 ft (9.8 m) long and 19 ft wide. If it were closed, the detour would be 29.2 mi (47 km).

Location

Open in Google Maps
CarriesCounty Road 303
CrossesClarks Valley Creek
Location1.5 MI N RD 400
RouteCounty Highway 0
CountyGlenn County
StateCalifornia
Coordinates39.4948, -122.45397
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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.5 US tons
Inventory rating17.2 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length32 ft (9.8 m)
Longest span30 ft (9.1 m)
Deck width19 ft (5.8 m)
Roadway width18 ft (5.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27 (2011)
Projected traffic35 by 2043
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.2 mi (47 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 303 over Clarks Valley Creek built?

It was built in 1935, making it 90 years old in 2025.

What condition is County Road 303 over Clarks Valley 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 2023.

How much traffic does County Road 303 over Clarks Valley Creek carry?

About 27 vehicles per day (2011 count).

How long is County Road 303 over Clarks Valley Creek?

The structure is 32 ft (9.8 m) long with a longest span of 30 ft (9.1 m) and a deck 19 ft wide.

Who owns County Road 303 over Clarks Valley Creek?

It is owned by the County Highway Agency.