US Bridges

County Road 303 over Clarks Valley Creek

Poor

Glenn County, California · 5.0 MI S RD 302 · Structure no. 11C0160

Built
1935
90 years old
Condition
Poor
inspected August 2023
Type
Tee Beam
Concrete Continuous
Length
30 ft
2 main spans
Daily traffic
27
2011 count
Owner
County
County Highway Agency

About this bridge

County Road 303 over Clarks Valley Creek is a concrete continuous tee beam 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 27 vehicles a day, projected to reach 35 by 2043. The structure is 30 ft (9.1 m) long and 21 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
Location5.0 MI S RD 302
RouteCounty Highway 0
CountyGlenn County
StateCalifornia
Coordinates39.50648, -122.45382
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating29.7 US tons
Inventory rating17.9 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length30 ft (9.1 m)
Longest span14 ft (4.4 m)
Deck width21 ft (6.4 m)
Roadway width19 ft (5.8 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$224,000 (2024 estimate)
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 poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. 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 30 ft (9.1 m) long with a longest span of 14 ft (4.4 m) and a deck 21 ft wide.

Who owns County Road 303 over Clarks Valley Creek?

It is owned by the County Highway Agency.