US Bridges

Stc 5711;MOON Pass over Squaw Creek

Fair

Shoshone County, Idaho · 3.5 N. 1.6 E. Avery · Structure no. 000000000030920

Built
1909
116 years old, rebuilt 1989
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
517 ft
9 main spans
Daily traffic
370
2023 count
Owner
County
County Highway Agency

About this bridge

Stc 5711;MOON Pass over Squaw Creek is a steel stringer/multi-beam or girder carrying Stc 5711;MOON Pass over Squaw Creek in Shoshone County, Idaho. It was built in 1909 and reconstructed in 1989, so it is 116 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.

It carries about 370 vehicles a day, roughly 3% of them trucks, projected to reach 555 by 2042. The structure is 517 ft (157.6 m) long and 17 ft wide. If it were closed, the detour would be 39.1 mi (63 km).

Location

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CarriesStc 5711;MOON Pass
CrossesSquaw Creek
Location3.5 N. 1.6 E. Avery
RouteCounty Highway 5711
CountyShoshone County
StateIdaho
Coordinates47.30158, -115.77197
Functional classRural Major 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating110.1 US tons
Inventory rating86 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, precast panels
Main spans9
Design loadHS 20
Structure length517 ft (157.6 m)
Longest span90 ft (27.3 m)
Deck width17 ft (5.3 m)
Roadway width16 ft (4.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic370 (2023)
Projected traffic555 by 2042
Trucks3%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed39.1 mi (63 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$4.1 million (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Stc 5711;MOON Pass over Squaw Creek built?

It was built in 1909, making it 116 years old in 2025. It was reconstructed in 1989.

What condition is Stc 5711;MOON Pass over Squaw 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 August 2024.

How much traffic does Stc 5711;MOON Pass over Squaw Creek carry?

About 370 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Stc 5711;MOON Pass over Squaw Creek?

The structure is 517 ft (157.6 m) long with a longest span of 90 ft (27.3 m) and a deck 17 ft wide.

Who owns Stc 5711;MOON Pass over Squaw Creek?

It is owned by the County Highway Agency.