US Bridges

RD 763 over Fisher River

Poor

Lincoln County, Montana · Fisher River · Structure no. 011406000000172

Built
1969
56 years old
Condition
Poor
inspected September 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
169 ft
4 main spans
Daily traffic
50
Owner
Federal
U.S. Forest Service

About this bridge

RD 763 over Fisher River is a wood or timber stringer/multi-beam or girder carrying RD 763 over Fisher River in Lincoln County, Montana. It was built in 1969, so it is 56 years old, older than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 50 vehicles a day, projected to reach 75 by 2045. The structure is 169 ft (51.5 m) long and 30 ft wide.

CarriesRD 763
CrossesFisher River
LocationFisher River
RouteFederal Lands Road 763
StateMontana
Coordinates48.21503, -115.272
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.7 US tons
Inventory rating42.1 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans4
Design loadUnknown
Structure length169 ft (51.5 m)
Longest span42 ft (12.7 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (—)
Projected traffic75 by 2045
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 RD 763 over Fisher River built?

It was built in 1969, making it 56 years old in 2025.

What condition is RD 763 over Fisher River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2023.

How much traffic does RD 763 over Fisher River carry?

About 50 vehicles per day (latest count).

How long is RD 763 over Fisher River?

The structure is 169 ft (51.5 m) long with a longest span of 42 ft (12.7 m) and a deck 30 ft wide.

Who owns RD 763 over Fisher River?

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