US Bridges

CO RD #99 W over Willow Creek

Fair

Glenn County, California · 0.7 MI N of CO RD #48 · Structure no. 11C0189

Built
1915
110 years old, rebuilt 1937
Condition
Fair
inspected August 2023
Type
Culvert
Concrete Continuous
Length
44 ft
3 main spans
Daily traffic
2,678
2009 count
Owner
County
County Highway Agency

About this bridge

CO RD #99 W over Willow Creek is a concrete continuous culvert carrying CO RD #99 W over Willow Creek in Glenn County, California. It was built in 1915 and reconstructed in 1937, so it is 110 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 6 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 2,678 vehicles a day, roughly 20% of them trucks, projected to reach 3,016 by 2041. The structure is 44 ft (13.4 m) long and 39 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCO RD #99 W
CrossesWillow Creek
Location0.7 MI N of CO RD #48
RouteCounty Highway 0
CountyGlenn County
StateCalifornia
Coordinates39.54961, -122.19349
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating17.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length44 ft (13.4 m)
Longest span13 ft (4.1 m)
Deck width39 ft (12 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,678 (2009)
Projected traffic3,016 by 2041
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 CO RD #99 W over Willow Creek built?

It was built in 1915, making it 110 years old in 2025. It was reconstructed in 1937.

What condition is CO RD #99 W 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 2023.

How much traffic does CO RD #99 W over Willow Creek carry?

About 2,678 vehicles per day (2009 count), of which roughly 20% are trucks.

How long is CO RD #99 W over Willow Creek?

The structure is 44 ft (13.4 m) long with a longest span of 13 ft (4.1 m) and a deck 39 ft wide.

Who owns CO RD #99 W over Willow Creek?

It is owned by the County Highway Agency.