US Bridges

SH 47 over Warm River

Fair

Fremont County, Idaho · At Warm River · Structure no. 000000000014425

Built
1984
41 years old
Condition
Fair
inspected August 2021
Type
Slab
Concrete Continuous
Length
98 ft
2 main spans
Daily traffic
510
2023 count
Owner
State
State Highway Agency

About this bridge

SH 47 over Warm River is a concrete continuous slab carrying SH 47 over Warm River in Fremont County, Idaho. It was built in 1984, so it is 41 years old, younger 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 510 vehicles a day, roughly 52% of them trucks, projected to reach 765 by 2042. The structure is 98 ft (29.9 m) long and 34 ft wide. If it were closed, the detour would be 31.1 mi (50 km).

Location

Open in Google Maps
CarriesSH 47
CrossesWarm River
LocationAt Warm River
RouteState Highway 47
CountyFremont County
StateIdaho
Coordinates44.11533, -111.32006
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2021
Inspection intervalevery 48 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating39 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length98 ft (29.9 m)
Longest span48 ft (14.6 m)
Deck width34 ft (10.4 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic510 (2023)
Projected traffic765 by 2042
Trucks52%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed31.1 mi (50 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 47 over Warm River built?

It was built in 1984, making it 41 years old in 2025.

What condition is SH 47 over Warm River 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 2021.

How much traffic does SH 47 over Warm River carry?

About 510 vehicles per day (2023 count), of which roughly 52% are trucks.

How long is SH 47 over Warm River?

The structure is 98 ft (29.9 m) long with a longest span of 48 ft (14.6 m) and a deck 34 ft wide.

Who owns SH 47 over Warm River?

It is owned by the State Highway Agency.