Structure 11405000001091 · Lincoln County, MT

6761 over Fisher River

Carries 6761 over Fisher River, Houghton Creek.

Overall conditionFair

Set by its lowest-rated component: Substructure at 6 of 9.

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT55 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

55 ft end to end. Lengths and the car on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a multi-beam bridge.

Built198640 years old
Length55.1 ft16.8 m
Daily traffic20counted 1996
Last inspectedAugust 2022every 48 months

Location

StateMontana
CountyLincoln
LocationHoughton Creek
Carries6761
CrossesFisher River
Coordinates48.02638, -115.33902

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length55.1 ft (16.8 m)
Max Span53.5 ft (16.3 m)
Deck Width15.1 ft (4.6 m)
Deck Area77.3 sq m
Main Spans1
Year Built1986

Traffic

Avg Daily Traffic20 (1996)
Lanes On Bridge1

Inspection & Ownership

Last InspectionAugust 2022
Inspection FrequencyEvery 48 months
OwnerU.S. Forest Service
Historical SignificanceHistorical significance is not determined
Scour Critical5 — Stable for scour
Structure Number011405000001091

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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