US Bridges

STC2815;WARM Sprng over Big Wood River

FairPosted for load

Blaine County, Idaho · In Ketchum;warm Spring RD · Structure no. 000000000019560

Built
1972
53 years old
Condition
Fair
inspected September 2023
Type
Tee Beam
Prestressed Concrete
Length
72 ft
1 main span
Daily traffic
6,300
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

STC2815;WARM Sprng over Big Wood River is a prestressed concrete tee beam carrying STC2815;WARM Sprng over Big Wood River in Blaine County, Idaho. It was built in 1972, so it is 53 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. Its operating status is: posted for load restriction.

It carries about 6,300 vehicles a day, roughly 9% of them trucks, projected to reach 9,450 by 2042. The structure is 72 ft (21.9 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSTC2815;WARM Sprng
CrossesBig Wood River
LocationIn Ketchum;warm Spring RD
RouteCity Street 2815
CountyBlaine County
StateIdaho
Coordinates43.68756, -114.37308
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating41 US tons
Inventory rating8 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length72 ft (21.9 m)
Longest span69 ft (21 m)
Deck width30 ft (9.2 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,300 (2023)
Projected traffic9,450 by 2042
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was STC2815;WARM Sprng over Big Wood River built?

It was built in 1972, making it 53 years old in 2025.

What condition is STC2815;WARM Sprng over Big Wood 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 September 2023.

How much traffic does STC2815;WARM Sprng over Big Wood River carry?

About 6,300 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is STC2815;WARM Sprng over Big Wood River?

The structure is 72 ft (21.9 m) long with a longest span of 69 ft (21 m) and a deck 30 ft wide.

Who owns STC2815;WARM Sprng over Big Wood River?

It is owned by the City or Municipal Highway Agency.