US Bridges

US 93 over Carmen Creek

Fair

Lemhi County, Idaho · 5.5 N. Salmon · Structure no. 000000000017900

Built
1931
94 years old, rebuilt 1953
Condition
Fair
inspected October 2024
Type
Frame
Concrete
Length
24 ft
1 main span
Daily traffic
2,100
2023 count
Owner
State
State Highway Agency

About this bridge

US 93 over Carmen Creek is a concrete frame carrying US 93 over Carmen Creek in Lemhi County, Idaho. It was built in 1931 and reconstructed in 1953, so it is 94 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 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 2,100 vehicles a day, roughly 12% of them trucks, projected to reach 3,150 by 2042. The structure is 24 ft (7.3 m) long and 51 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesUS 93
CrossesCarmen Creek
Location5.5 N. Salmon
RouteU.S. Route 93
CountyLemhi County
StateIdaho
Coordinates45.24681, -113.89536
Functional classRural Principal Arterial - Other

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58 US tons
Inventory rating35.1 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length24 ft (7.3 m)
Longest span24 ft (7.3 m)
Deck width51 ft (15.5 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,100 (2023)
Projected traffic3,150 by 2042
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$480,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 93 over Carmen Creek built?

It was built in 1931, making it 94 years old in 2025. It was reconstructed in 1953.

What condition is US 93 over Carmen 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 October 2024.

How much traffic does US 93 over Carmen Creek carry?

About 2,100 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is US 93 over Carmen Creek?

The structure is 24 ft (7.3 m) long with a longest span of 24 ft (7.3 m) and a deck 51 ft wide.

Who owns US 93 over Carmen Creek?

It is owned by the State Highway Agency.