US Bridges

Squaw Creek RD over Salmon River;sw.Clayton

FairPosted for load

Custer County, Idaho · 0.7 S. 2.8 W. Clayton · Structure no. 000000000031655

Built
1970
55 years old
Condition
Fair
inspected July 2023
Type
Tee Beam
Prestressed Concrete
Length
140 ft
2 main spans
Daily traffic
106
2023 count
Owner
County
County Highway Agency

About this bridge

Squaw Creek RD over Salmon River;sw.Clayton is a prestressed concrete tee beam carrying Squaw Creek RD over Salmon River;sw.Clayton in Custer County, Idaho. It was built in 1970, so it is 55 years old, older than the Idaho average of 45.3 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. Its operating status is: posted for load restriction.

It carries about 106 vehicles a day, roughly 10% of them trucks, projected to reach 159 by 2039. The structure is 140 ft (42.7 m) long and 20 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSquaw Creek RD
CrossesSalmon River;sw.Clayton
Location0.7 S. 2.8 W. Clayton
RouteCounty Highway 0
StateIdaho
Coordinates44.24822, -114.45594
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating29 US tons
Inventory rating23 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length140 ft (42.7 m)
Longest span70 ft (21.3 m)
Deck width20 ft (6.1 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic106 (2023)
Projected traffic159 by 2039
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.3 million (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Squaw Creek RD over Salmon River;sw.Clayton built?

It was built in 1970, making it 55 years old in 2025.

What condition is Squaw Creek RD over Salmon River;sw.Clayton 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 July 2023.

How much traffic does Squaw Creek RD over Salmon River;sw.Clayton carry?

About 106 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Squaw Creek RD over Salmon River;sw.Clayton?

The structure is 140 ft (42.7 m) long with a longest span of 70 ft (21.3 m) and a deck 20 ft wide.

Who owns Squaw Creek RD over Salmon River;sw.Clayton?

It is owned by the County Highway Agency.