US Bridges

West Louie RD over Willow Creek

Good

Siskiyou County, California · 0.8 MI E Old Highway 99 · Structure no. 02C0146

Built
1989
36 years old
Condition
Good
inspected June 2023
Type
Slab
Concrete Continuous
Length
51 ft
2 main spans
Daily traffic
65
2011 count
Owner
County
County Highway Agency

About this bridge

West Louie RD over Willow Creek is a concrete continuous slab carrying West Louie RD over Willow Creek in Siskiyou County, California. It was built in 1989, so it is 36 years old, younger 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 65 vehicles a day, roughly 8% of them trucks, projected to reach 221 by 2045. The structure is 51 ft (15.4 m) long and 25 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

CarriesWest Louie RD
CrossesWillow Creek
Location0.8 MI E Old Highway 99
RouteCounty Highway 0
Coordinates41.53426, -122.51132
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length51 ft (15.4 m)
Longest span25 ft (7.6 m)
Deck width25 ft (7.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic65 (2011)
Projected traffic221 by 2045
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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 West Louie RD over Willow Creek built?

It was built in 1989, making it 36 years old in 2025.

What condition is West Louie RD over Willow 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 June 2023.

How much traffic does West Louie RD over Willow Creek carry?

About 65 vehicles per day (2011 count), of which roughly 8% are trucks.

How long is West Louie RD over Willow Creek?

The structure is 51 ft (15.4 m) long with a longest span of 25 ft (7.6 m) and a deck 25 ft wide.

Who owns West Louie RD over Willow Creek?

It is owned by the County Highway Agency.