US Bridges

County Road 303 over Clarks Valley Creek

Good

Glenn County, California · 2.5 MI S HWY 162 · Structure no. 11C0164

Built
1950
75 years old
Condition
Good
inspected August 2023
Type
Slab
Concrete Continuous
Length
92 ft
3 main spans
Daily traffic
55
2006 count
Owner
County
County Highway Agency

About this bridge

County Road 303 over Clarks Valley Creek is a concrete continuous slab carrying County Road 303 over Clarks Valley Creek in Glenn County, California. It was built in 1950, so it is 75 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 55 vehicles a day, projected to reach 70 by 2043. The structure is 92 ft (28 m) long and 22 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesCounty Road 303
CrossesClarks Valley Creek
Location2.5 MI S HWY 162
RouteCounty Highway 0
CountyGlenn County
StateCalifornia
Coordinates39.55561, -122.43836
Functional classRural Local

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 protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating55.3 US tons
Inventory rating33.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length92 ft (28 m)
Longest span36 ft (11 m)
Deck width22 ft (6.7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic55 (2006)
Projected traffic70 by 2043
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 1950, making it 75 years old in 2025.

What condition is County Road 303 over Clarks Valley 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 August 2023.

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

About 55 vehicles per day (2006 count).

How long is County Road 303 over Clarks Valley Creek?

The structure is 92 ft (28 m) long with a longest span of 36 ft (11 m) and a deck 22 ft wide.

Who owns County Road 303 over Clarks Valley Creek?

It is owned by the County Highway Agency.