US Bridges

Silver Creek Plung over Silver Creek

Good

Valley County, Idaho · Silver Creek Plunge Cg · Structure no. 040206000003070

Built
2005
20 years old
Condition
Good
inspected September 2023
Type
Slab
Prestressed Concrete
Length
46 ft
1 main span
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

Silver Creek Plung over Silver Creek is a prestressed concrete slab carrying Silver Creek Plung over Silver Creek in Valley County, Idaho. It was built in 2005, so it is 20 years old, younger than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 50 vehicles a day, projected to reach 75 by 2045. The structure is 46 ft (14 m) long and 24 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

CarriesSilver Creek Plung
CrossesSilver Creek
LocationSilver Creek Plunge Cg
RouteFederal Lands Road 671W1
StateIdaho
Coordinates44.33054, -115.80344
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating29.3 US tons
Inventory rating22.5 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length46 ft (14 m)
Longest span45 ft (13.7 m)
Deck width24 ft (7.3 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (—)
Projected traffic75 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Silver Creek Plung over Silver Creek built?

It was built in 2005, making it 20 years old in 2025.

What condition is Silver Creek Plung over Silver 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 2023.

How much traffic does Silver Creek Plung over Silver Creek carry?

About 50 vehicles per day (latest count).

How long is Silver Creek Plung over Silver Creek?

The structure is 46 ft (14 m) long with a longest span of 45 ft (13.7 m) and a deck 24 ft wide.

Who owns Silver Creek Plung over Silver Creek?

It is owned by the U.S. Forest Service.