Structure 11006000003041 · Flathead County, MT

Forest Road over Graves Creek

Carries Forest Road over Graves Creek, Graves Creek.

Overall conditionGood

Set by its lowest-rated component: Substructure at 7 of 9.

How ratings work
Superstructure8/9 · Very Good
Substructuresets the rating7/9 · Good
Channelnot part of overall9/9 · Excellent
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT81 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck not ratedSuperstructure 8/9Substructure 7/9 · sets the rating

81 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.

Built200224 years old
Length81.4 ft24.8 m
Daily traffic75counted 1989
Last inspectedJuly 2024every 48 months

Location

StateMontana
CountyFlathead
LocationGraves Creek
CarriesForest Road
CrossesGraves Creek
Coordinates48.12693, -113.80961

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length81.4 ft (24.8 m)
Max Span59.1 ft (18 m)
Deck Width29.9 ft (9.1 m)
Deck Area225.7 sq m
Main Spans1
Year Built2002

Traffic

Avg Daily Traffic75 (1989)
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2024
Inspection FrequencyEvery 48 months
OwnerU.S. Forest Service
Historical SignificanceHistorical significance is not determined
Scour Critical8 — Stable, low risk
Structure Number011006000003041

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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