US Bridges

Thompson CR RD over S Fk Fish Creek

Good

Mineral County, Montana · Thompson CR Fish CR · Structure no. 011604000022622

Built
1999
26 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
88 ft
1 main span
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

Thompson CR RD over S Fk Fish Creek is a prestressed concrete stringer/multi-beam or girder carrying Thompson CR RD over S Fk Fish Creek in Mineral County, Montana. It was built in 1999, so it is 26 years old, younger than the Montana average of 47 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 50 vehicles a day, projected to reach 75 by 2045. The structure is 88 ft (26.8 m) long and 15 ft wide. If it were closed, the detour would be 98.2 mi (158 km).

CarriesThompson CR RD
CrossesS Fk Fish Creek
LocationThompson CR Fish CR
RouteFederal Lands Road 7730
StateMontana
Coordinates46.89062, -114.68628
Functional classRural Local

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to 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 rating37.5 US tons
Inventory rating29.3 US tons

Structure

MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length88 ft (26.8 m)
Longest span85 ft (25.9 m)
Deck width15 ft (4.7 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (—)
Projected traffic75 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.2 mi (158 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 Thompson CR RD over S Fk Fish Creek built?

It was built in 1999, making it 26 years old in 2025.

What condition is Thompson CR RD over S Fk Fish Creek 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 October 2024.

How much traffic does Thompson CR RD over S Fk Fish Creek carry?

About 50 vehicles per day (latest count).

How long is Thompson CR RD over S Fk Fish Creek?

The structure is 88 ft (26.8 m) long with a longest span of 85 ft (25.9 m) and a deck 15 ft wide.

Who owns Thompson CR RD over S Fk Fish Creek?

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