US Bridges

State Route 254 over Ohman Creek

Good

Humboldt County, California · 01-HUM-254-0.88 · Structure no. 04 0007

Built
1939
86 years old
Condition
Good
inspected September 2024
Type
Tee Beam
Concrete Continuous
Length
160 ft
5 main spans
Daily traffic
690
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 254 over Ohman Creek is a concrete continuous tee beam carrying State Route 254 over Ohman Creek in Humboldt County, California. It was built in 1939, so it is 86 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 690 vehicles a day, roughly 6% of them trucks, projected to reach 810 by 2046. The structure is 160 ft (48.8 m) long and 31 ft wide. If it were closed, the detour would be 24.9 mi (40 km).

CarriesState Route 254
CrossesOhman Creek
Location01-HUM-254-0.88
RouteState Highway 254
Coordinates40.19256, -123.7682
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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating27.4 US tons
Inventory rating21.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadH 15
Structure length160 ft (48.8 m)
Longest span43 ft (13.1 m)
Deck width31 ft (9.4 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic690 (2009)
Projected traffic810 by 2046
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 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 254 over Ohman Creek built?

It was built in 1939, making it 86 years old in 2025.

What condition is State Route 254 over Ohman 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 254 over Ohman Creek carry?

About 690 vehicles per day (2009 count), of which roughly 6% are trucks.

How long is State Route 254 over Ohman Creek?

The structure is 160 ft (48.8 m) long with a longest span of 43 ft (13.1 m) and a deck 31 ft wide.

Who owns State Route 254 over Ohman Creek?

It is owned by the State Highway Agency.