US Bridges

Stc 6770; N Salem over N.Fk.Teton River

Fair

Madison County, Idaho · 4.8 N. 0.6 E. Rexburg · Structure no. 000000000020985

Built
1976
49 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
87 ft
1 main span
Daily traffic
4,000
2023 count
Owner
County
County Highway Agency

About this bridge

Stc 6770; N Salem over N.Fk.Teton River is a prestressed concrete stringer/multi-beam or girder carrying Stc 6770; N Salem over N.Fk.Teton River in Madison County, Idaho. It was built in 1976, so it is 49 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 4,000 vehicles a day, roughly 10% of them trucks, projected to reach 6,000 by 2042. The structure is 87 ft (26.5 m) long and 38 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesStc 6770; N Salem
CrossesN.Fk.Teton River
Location4.8 N. 0.6 E. Rexburg
RouteCounty Highway 6770
CountyMadison County
StateIdaho
Coordinates43.88239, -111.77786
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.1 US tons
Inventory rating30 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length87 ft (26.5 m)
Longest span85 ft (25.9 m)
Deck width38 ft (11.5 m)
Roadway width35 ft (10.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,000 (2023)
Projected traffic6,000 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 6770; N Salem over N.Fk.Teton River built?

It was built in 1976, making it 49 years old in 2025.

What condition is Stc 6770; N Salem over N.Fk.Teton 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 April 2024.

How much traffic does Stc 6770; N Salem over N.Fk.Teton River carry?

About 4,000 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Stc 6770; N Salem over N.Fk.Teton River?

The structure is 87 ft (26.5 m) long with a longest span of 85 ft (25.9 m) and a deck 38 ft wide.

Who owns Stc 6770; N Salem over N.Fk.Teton River?

It is owned by the County Highway Agency.