US Bridges

State Route 96 over Slate Creek

Fair

Humboldt County, California · 01-HUM-096-29.92 · Structure no. 04 0061

Built
1960
65 years old
Condition
Fair
inspected September 2024
Type
Tee Beam
Concrete Continuous
Length
177 ft
3 main spans
Daily traffic
540
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 96 over Slate Creek is a concrete continuous tee beam carrying State Route 96 over Slate Creek in Humboldt County, California. It was built in 1960, so it is 65 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 540 vehicles a day, roughly 12% of them trucks, projected to reach 511 by 2046. The structure is 177 ft (54.1 m) long and 30 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesState Route 96
CrossesSlate Creek
Location01-HUM-096-29.92
RouteState Highway 96
CountyHumboldt County
StateCalifornia
Coordinates41.25068, -123.64365
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating20.4 US tons
Inventory rating13.6 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length177 ft (54.1 m)
Longest span80 ft (24.4 m)
Deck width30 ft (9 m)
Roadway width26 ft (7.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic540 (2009)
Projected traffic511 by 2046
Trucks12%
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

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 Slate Creek built?

It was built in 1960, making it 65 years old in 2025.

What condition is State Route 96 over Slate 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 September 2024.

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

About 540 vehicles per day (2009 count), of which roughly 12% are trucks.

How long is State Route 96 over Slate Creek?

The structure is 177 ft (54.1 m) long with a longest span of 80 ft (24.4 m) and a deck 30 ft wide.

Who owns State Route 96 over Slate Creek?

It is owned by the State Highway Agency.