US Bridges

So. Fk. Teton Rd. over Teton River

Fair

Teton County, Montana · 25 Mi. NW of Choteau Mt. · Structure no. 011501000001004

Built
1944
81 years old
Condition
Fair
inspected October 2023
Type
Truss - Thru
Steel
Length
80 ft
1 main span
Daily traffic
16
1989 count
Owner
Federal
U.S. Forest Service

About this bridge

So. Fk. Teton Rd. over Teton River is a steel truss - thru carrying So. Fk. Teton Rd. over Teton River in Teton County, Montana. It was built in 1944, so it is 81 years old, older than the Montana average of 47 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 16 vehicles a day, projected to reach 24 by 2045. The structure is 80 ft (24.4 m) long and 13 ft wide. If it were closed, the detour would be 47.2 mi (76 km).

Location

Open in Google Maps
CarriesSo. Fk. Teton Rd.
CrossesTeton River
Location25 Mi. NW of Choteau Mt.
RouteCounty Highway 109
CountyTeton County
StateMontana
Coordinates47.88307, -112.61196
Functional classRural Local

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 protection3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Last inspectionOctober 2023
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating30.3 US tons
Inventory rating23.3 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadOther
Structure length80 ft (24.4 m)
Longest span78 ft (23.8 m)
Deck width13 ft (4.1 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16 (1989)
Projected traffic24 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed47.2 mi (76 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was So. Fk. Teton Rd. over Teton River built?

It was built in 1944, making it 81 years old in 2025.

What condition is So. Fk. Teton Rd. over 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 October 2023.

How much traffic does So. Fk. Teton Rd. over Teton River carry?

About 16 vehicles per day (1989 count).

How long is So. Fk. Teton Rd. over Teton River?

The structure is 80 ft (24.4 m) long with a longest span of 78 ft (23.8 m) and a deck 13 ft wide.

Who owns So. Fk. Teton Rd. over Teton River?

It is owned by the U.S. Forest Service.