US Bridges

Stc 6760; W4000N over Warm Slough

Fair

Madison County, Idaho · 3.3 W. 4.7 N. Rexburg · Structure no. 000000000020930

Built
1969
56 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
88 ft
2 main spans
Daily traffic
1,000
2023 count
Owner
County
County Highway Agency

About this bridge

Stc 6760; W4000N over Warm Slough is a prestressed concrete stringer/multi-beam or girder carrying Stc 6760; W4000N over Warm Slough in Madison County, Idaho. It was built in 1969, so it is 56 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 1,000 vehicles a day, roughly 10% of them trucks, projected to reach 1,500 by 2042. The structure is 88 ft (26.8 m) long and 38 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesStc 6760; W4000N
CrossesWarm Slough
Location3.3 W. 4.7 N. Rexburg
RouteCounty Highway 6760
CountyMadison County
StateIdaho
Coordinates43.89342, -111.85497
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61 US tons
Inventory rating32 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length88 ft (26.8 m)
Longest span43 ft (13.1 m)
Deck width38 ft (11.5 m)
Roadway width35 ft (10.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (2023)
Projected traffic1,500 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Stc 6760; W4000N over Warm Slough built?

It was built in 1969, making it 56 years old in 2025.

What condition is Stc 6760; W4000N over Warm Slough 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 April 2024.

How much traffic does Stc 6760; W4000N over Warm Slough carry?

About 1,000 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Stc 6760; W4000N over Warm Slough?

The structure is 88 ft (26.8 m) long with a longest span of 43 ft (13.1 m) and a deck 38 ft wide.

Who owns Stc 6760; W4000N over Warm Slough?

It is owned by the County Highway Agency.