US Bridges

Constr. Fac. Br. over Powerhouse Forebay Water

Fair

Garfield County, Washington · Lower Granite Dam · Structure no. CEPNPWWA0LGRCON

Built
1973
52 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
164 ft
2 main spans
Daily traffic
50
2019 count
Owner
Federal
Corps of Engineers (Civil)

About this bridge

Constr. Fac. Br. over Powerhouse Forebay Water is a prestressed concrete stringer/multi-beam or girder carrying Constr. Fac. Br. over Powerhouse Forebay Water in Garfield County, Washington. It was built in 1973, so it is 52 years old, older than the Washington average of 49.8 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 50 vehicles a day, roughly 2% of them trucks, projected to reach 50 by 2041. The structure is 164 ft (49.9 m) long and 29 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesConstr. Fac. Br.
CrossesPowerhouse Forebay Water
LocationLower Granite Dam
CountyGarfield County
StateWashington
Coordinates46.65677, -117.43154
Functional classRural Minor Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.9 US tons
Inventory rating49.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length164 ft (49.9 m)
Longest span82 ft (24.9 m)
Deck width29 ft (8.9 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2019)
Projected traffic50 by 2041
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCorps of Engineers (Civil)
Maintained byCorps of Engineers (Civil)
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$632,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Constr. Fac. Br. over Powerhouse Forebay Water built?

It was built in 1973, making it 52 years old in 2025.

What condition is Constr. Fac. Br. over Powerhouse Forebay Water 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 2024.

How much traffic does Constr. Fac. Br. over Powerhouse Forebay Water carry?

About 50 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is Constr. Fac. Br. over Powerhouse Forebay Water?

The structure is 164 ft (49.9 m) long with a longest span of 82 ft (24.9 m) and a deck 29 ft wide.

Who owns Constr. Fac. Br. over Powerhouse Forebay Water?

It is owned by the Corps of Engineers (Civil).