US Bridges

Trout Creek RD over Little Blackfoot R 018

FairPosted for load

Powell County, Montana · Avon · Structure no. L39103000+01001

Built
1908
117 years old, rebuilt 1999
Condition
Fair
inspected June 2023
Type
Truss - Thru
Steel
Length
127 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Trout Creek RD over Little Blackfoot R 018 is a steel truss - thru carrying Trout Creek RD over Little Blackfoot R 018 in Powell County, Montana. It was built in 1908 and reconstructed in 1999, so it is 117 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 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 127 ft (38.7 m) long and 16 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesTrout Creek RD
CrossesLittle Blackfoot R 018
LocationAvon
RouteCounty Highway 39052
StateMontana
Coordinates46.59558, -112.59147
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating19 US tons
Inventory rating12 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1 (+1 approach)
Design loadUnknown
Structure length127 ft (38.7 m)
Longest span108 ft (32.9 m)
Deck width16 ft (4.9 m)
Roadway width15 ft (4.6 m)
Vertical clearance over deck15 ft (4.7 m)

Traffic and service

Average daily traffic100 (2025)
Projected traffic100 by 2040
Trucks3%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$306,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Trout Creek RD over Little Blackfoot R 018 built?

It was built in 1908, making it 117 years old in 2025. It was reconstructed in 1999.

What condition is Trout Creek RD over Little Blackfoot R 018 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 June 2023.

How much traffic does Trout Creek RD over Little Blackfoot R 018 carry?

About 100 vehicles per day (2025 count), of which roughly 3% are trucks.

How long is Trout Creek RD over Little Blackfoot R 018?

The structure is 127 ft (38.7 m) long with a longest span of 108 ft (32.9 m) and a deck 16 ft wide.

Who owns Trout Creek RD over Little Blackfoot R 018?

It is owned by the County Highway Agency.