US Bridges

State Route 96 over Willow Creek

Good

Humboldt County, California · 01-HUM-096-0.24 · Structure no. 04 0135

Built
1965
60 years old
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
345 ft
4 main spans
Daily traffic
2,900
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 96 over Willow Creek is a steel stringer/multi-beam or girder carrying State Route 96 over Willow Creek in Humboldt County, California. It was built in 1965, so it is 60 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 2,900 vehicles a day, roughly 2% of them trucks, projected to reach 3,728 by 2046. The structure is 345 ft (105.2 m) long and 37 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesState Route 96
CrossesWillow Creek
Location01-HUM-096-0.24
RouteState Highway 96
CountyHumboldt County
StateCalifornia
Coordinates40.94339, -123.63337
Functional classRural Minor Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.1 US tons
Inventory rating40.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length345 ft (105.2 m)
Longest span102 ft (31.1 m)
Deck width37 ft (11.3 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,900 (2009)
Projected traffic3,728 by 2046
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 State Route 96 over Willow Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is State Route 96 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 September 2024.

How much traffic does State Route 96 over Willow Creek carry?

About 2,900 vehicles per day (2009 count), of which roughly 2% are trucks.

How long is State Route 96 over Willow Creek?

The structure is 345 ft (105.2 m) long with a longest span of 102 ft (31.1 m) and a deck 37 ft wide.

Who owns State Route 96 over Willow Creek?

It is owned by the State Highway Agency.