US Bridges

Anderson LN over Beaverhead River 071

FairPosted for load

Beaverhead County, Montana · 5M NE Dillon · Structure no. L01316001+00001

Built
1930
95 years old
Condition
Fair
inspected July 2024
Type
Truss - Thru
Steel
Length
100 ft
1 main span
Daily traffic
54
2023 count
Owner
County
County Highway Agency

About this bridge

Anderson LN over Beaverhead River 071 is a steel truss - thru carrying Anderson LN over Beaverhead River 071 in Beaverhead County, Montana. It was built in 1930, so it is 95 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. Its operating status is: posted for load restriction.

It carries about 54 vehicles a day, roughly 3% of them trucks, projected to reach 58 by 2043. The structure is 100 ft (30.5 m) long and 16 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesAnderson LN
CrossesBeaverhead River 071
Location5M NE Dillon
RouteCounty Highway 1316
CountyBeaverhead County
StateMontana
Coordinates45.30515, -112.56339
Functional classRural Minor 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating8 US tons
Inventory rating6 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length100 ft (30.5 m)
Longest span100 ft (30.5 m)
Deck width16 ft (5 m)
Roadway width15 ft (4.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic54 (2023)
Projected traffic58 by 2043
Trucks3%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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$252,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Anderson LN over Beaverhead River 071 built?

It was built in 1930, making it 95 years old in 2025.

What condition is Anderson LN over Beaverhead River 071 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 July 2024.

How much traffic does Anderson LN over Beaverhead River 071 carry?

About 54 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Anderson LN over Beaverhead River 071?

The structure is 100 ft (30.5 m) long with a longest span of 100 ft (30.5 m) and a deck 16 ft wide.

Who owns Anderson LN over Beaverhead River 071?

It is owned by the County Highway Agency.