US Bridges

U.S. Highway 101 over ST RTE 254-S101 on Ramp

Fair

Humboldt County, California · 01-HUM-101-35.70 · Structure no. 04 0064

Built
1958
67 years old
Condition
Fair
inspected August 2023
Type
Slab
Concrete Continuous
Length
85 ft
3 main spans
Daily traffic
5,400
2009 count
Owner
State
State Highway Agency

About this bridge

U.S. Highway 101 over ST RTE 254-S101 on Ramp is a concrete continuous slab carrying U.S. Highway 101 over ST RTE 254-S101 on Ramp in Humboldt County, California. It was built in 1958, so it is 67 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 5 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 5,400 vehicles a day, roughly 22% of them trucks, projected to reach 7,432 by 2045. The structure is 85 ft (25.9 m) long and 65 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

Open in Google Maps
CarriesU.S. Highway 101
CrossesST RTE 254-S101 on Ramp
Location01-HUM-101-35.70
RouteU.S. Route 101
CountyHumboldt County
StateCalifornia
Coordinates40.35291, -123.9279
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.5 US tons
Inventory rating25 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length85 ft (25.9 m)
Longest span32 ft (9.8 m)
Deck width65 ft (19.9 m)
Roadway width61 ft (18.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,400 (2009)
Projected traffic7,432 by 2045
Trucks22%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed16.8 mi (27 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was U.S. Highway 101 over ST RTE 254-S101 on Ramp built?

It was built in 1958, making it 67 years old in 2025.

What condition is U.S. Highway 101 over ST RTE 254-S101 on Ramp 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 U.S. Highway 101 over ST RTE 254-S101 on Ramp carry?

About 5,400 vehicles per day (2009 count), of which roughly 22% are trucks.

How long is U.S. Highway 101 over ST RTE 254-S101 on Ramp?

The structure is 85 ft (25.9 m) long with a longest span of 32 ft (9.8 m) and a deck 65 ft wide.

Who owns U.S. Highway 101 over ST RTE 254-S101 on Ramp?

It is owned by the State Highway Agency.