US Bridges

County Road 39 over Wilson Creek

Good

Glenn County, California · 0.75 MI East of CR D · Structure no. 11C0269

Built
1950
75 years old, rebuilt 1970
Condition
Good
inspected August 2024
Type
Slab
Concrete Continuous
Length
58 ft
3 main spans
Daily traffic
491
2011 count
Owner
County
County Highway Agency

About this bridge

County Road 39 over Wilson Creek is a concrete continuous slab carrying County Road 39 over Wilson Creek in Glenn County, California. It was built in 1950 and reconstructed in 1970, 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 491 vehicles a day, roughly 10% of them trucks, projected to reach 645 by 2042. The structure is 58 ft (17.7 m) long and 33 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

Open in Google Maps
CarriesCounty Road 39
CrossesWilson Creek
Location0.75 MI East of CR D
RouteCounty Highway 0
CountyGlenn County
StateCalifornia
Coordinates39.58234, -122.2357
Functional classRural Major Collector

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 protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length58 ft (17.7 m)
Longest span18 ft (5.5 m)
Deck width33 ft (10 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic491 (2011)
Projected traffic645 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18 mi (29 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 39 over Wilson Creek built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1970.

What condition is County Road 39 over Wilson 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 2024.

How much traffic does County Road 39 over Wilson Creek carry?

About 491 vehicles per day (2011 count), of which roughly 10% are trucks.

How long is County Road 39 over Wilson Creek?

The structure is 58 ft (17.7 m) long with a longest span of 18 ft (5.5 m) and a deck 33 ft wide.

Who owns County Road 39 over Wilson Creek?

It is owned by the County Highway Agency.