US Bridges

Steelhead RD over Powers Creek

Fair

Humboldt County, California · 2.5 MI E/O Alderpoint RD · Structure no. 04C0254

Built
2007
18 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
60 ft
1 main span
Daily traffic
50
2010 count
Owner
County
County Highway Agency

About this bridge

Steelhead RD over Powers Creek is a steel stringer/multi-beam or girder carrying Steelhead RD over Powers Creek in Humboldt County, California. It was built in 2007, so it is 18 years old, younger 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 50 vehicles a day, roughly 5% of them trucks, projected to reach 53 by 2042. The structure is 60 ft (18.3 m) long and 10 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesSteelhead RD
CrossesPowers Creek
Location2.5 MI E/O Alderpoint RD
CountyHumboldt County
StateCalifornia
Coordinates40.16131, -123.64781
Functional classRural Local

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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating68.6 US tons
Inventory rating41.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckSteel plate
Main spans1
Design loadUnknown
Structure length60 ft (18.3 m)
Longest span50 ft (15.1 m)
Deck width10 ft (3.2 m)
Roadway width10 ft (2.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2010)
Projected traffic53 by 2042
Trucks5%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Steelhead RD over Powers Creek built?

It was built in 2007, making it 18 years old in 2025.

What condition is Steelhead RD over Powers 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 February 2024.

How much traffic does Steelhead RD over Powers Creek carry?

About 50 vehicles per day (2010 count), of which roughly 5% are trucks.

How long is Steelhead RD over Powers Creek?

The structure is 60 ft (18.3 m) long with a longest span of 50 ft (15.1 m) and a deck 10 ft wide.

Who owns Steelhead RD over Powers Creek?

It is owned by the County Highway Agency.