US Bridges

Stc 6760;S 3300 W over Texas Slough;w.Thornton

Good

Madison County, Idaho · 0.1 S. 0.3 W. Thornton · Structure no. 000000000032945

Built
1981
44 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
52 ft
1 main span
Daily traffic
400
2023 count
Owner
County
County Highway Agency

About this bridge

Stc 6760;S 3300 W over Texas Slough;w.Thornton is a prestressed concrete stringer/multi-beam or girder carrying Stc 6760;S 3300 W over Texas Slough;w.Thornton in Madison County, Idaho. It was built in 1981, so it is 44 years old, younger than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 400 vehicles a day, projected to reach 600 by 2042. The structure is 52 ft (15.8 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesStc 6760;S 3300 W
CrossesTexas Slough;w.Thornton
Location0.1 S. 0.3 W. Thornton
RouteCounty Highway 6760
CountyMadison County
StateIdaho
Coordinates43.75573, -111.84981
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.6 US tons
Inventory rating32.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length52 ft (15.8 m)
Longest span49 ft (14.9 m)
Deck width34 ft (10.3 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2023)
Projected traffic600 by 2042
Trucks0%
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

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;S 3300 W over Texas Slough;w.Thornton built?

It was built in 1981, making it 44 years old in 2025.

What condition is Stc 6760;S 3300 W over Texas Slough;w.Thornton in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2024.

How much traffic does Stc 6760;S 3300 W over Texas Slough;w.Thornton carry?

About 400 vehicles per day (2023 count).

How long is Stc 6760;S 3300 W over Texas Slough;w.Thornton?

The structure is 52 ft (15.8 m) long with a longest span of 49 ft (14.9 m) and a deck 34 ft wide.

Who owns Stc 6760;S 3300 W over Texas Slough;w.Thornton?

It is owned by the County Highway Agency.