US Bridges

Miner Lake RD over Big Hole River 093

Fair

Beaverhead County, Montana · 2M SW Jackson · Structure no. L01095001+07001

Built
2004
21 years old
Condition
Fair
inspected July 2023
Type
Tee Beam
Prestressed Concrete
Length
83 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Miner Lake RD over Big Hole River 093 is a prestressed concrete tee beam carrying Miner Lake RD over Big Hole River 093 in Beaverhead County, Montana. It was built in 2004, so it is 21 years old, younger 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.

It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 83 ft (25.3 m) long and 30 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesMiner Lake RD
CrossesBig Hole River 093
Location2M SW Jackson
RouteCounty Highway 1095
StateMontana
Coordinates45.36097, -113.44099
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating58 US tons
Inventory rating44 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length83 ft (25.3 m)
Longest span82 ft (25 m)
Deck width30 ft (9.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2025)
Projected traffic100 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-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$53,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Miner Lake RD over Big Hole River 093 built?

It was built in 2004, making it 21 years old in 2025.

What condition is Miner Lake RD over Big Hole River 093 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 2023.

How much traffic does Miner Lake RD over Big Hole River 093 carry?

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

How long is Miner Lake RD over Big Hole River 093?

The structure is 83 ft (25.3 m) long with a longest span of 82 ft (25 m) and a deck 30 ft wide.

Who owns Miner Lake RD over Big Hole River 093?

It is owned by the County Highway Agency.