US Bridges

State Route 254 over U.S. Highway 101

Good

Humboldt County, California · 01-HUM-254-19.94 · Structure no. 04 0114

Built
1961
64 years old
Condition
Good
inspected August 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
242 ft
3 main spans
Daily traffic
565
2014 count
Owner
State
State Highway Agency

About this bridge

State Route 254 over U.S. Highway 101 is a concrete continuous box beam or girders - multiple carrying State Route 254 over U.S. Highway 101 in Humboldt County, California. It was built in 1961, so it is 64 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 565 vehicles a day, roughly 6% of them trucks, projected to reach 1,462 by 2041. The structure is 242 ft (73.8 m) long and 34 ft wide. If it were closed, the detour would be 77.1 mi (124 km).

CarriesState Route 254
CrossesU.S. Highway 101
Location01-HUM-254-19.94
RouteState Highway 254
Coordinates40.34456, -123.93185
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.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating51.5 US tons
Inventory rating37.5 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length242 ft (73.8 m)
Longest span122 ft (37.2 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic565 (2014)
Projected traffic1,462 by 2041
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed77.1 mi (124 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was State Route 254 over U.S. Highway 101 built?

It was built in 1961, making it 64 years old in 2025.

What condition is State Route 254 over U.S. Highway 101 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 August 2024.

How much traffic does State Route 254 over U.S. Highway 101 carry?

About 565 vehicles per day (2014 count), of which roughly 6% are trucks.

How long is State Route 254 over U.S. Highway 101?

The structure is 242 ft (73.8 m) long with a longest span of 122 ft (37.2 m) and a deck 34 ft wide.

Who owns State Route 254 over U.S. Highway 101?

It is owned by the State Highway Agency.