US Bridges

6761 over Fisher River

Fair

Lincoln County, Montana · Houghton Creek · Structure no. 011405000001091

Built
1986
39 years old
Condition
Fair
inspected August 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
55 ft
1 main span
Daily traffic
20
1996 count
Owner
Federal
U.S. Forest Service

About this bridge

6761 over Fisher River is a prestressed concrete stringer/multi-beam or girder carrying 6761 over Fisher River in Lincoln County, Montana. It was built in 1986, so it is 39 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 20 vehicles a day, projected to reach 30 by 2045. The structure is 55 ft (16.8 m) long and 15 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Carries6761
CrossesFisher River
LocationHoughton Creek
RouteFederal Lands Road 6761
StateMontana
Coordinates48.02638, -115.33902
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating47.5 US tons
Inventory rating38.6 US tons

Structure

MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length55 ft (16.8 m)
Longest span53 ft (16.3 m)
Deck width15 ft (4.6 m)
Roadway width14 ft (4.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (1996)
Projected traffic30 by 2045
Trucks—
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

OwnerU.S. Forest Service
Maintained byPrivate (other than railroad)
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 6761 over Fisher River built?

It was built in 1986, making it 39 years old in 2025.

What condition is 6761 over Fisher 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 August 2022.

How much traffic does 6761 over Fisher River carry?

About 20 vehicles per day (1996 count).

How long is 6761 over Fisher River?

The structure is 55 ft (16.8 m) long with a longest span of 53 ft (16.3 m) and a deck 15 ft wide.

Who owns 6761 over Fisher River?

It is owned by the U.S. Forest Service and maintained by the Private (other than railroad).