Structure 11006000001095 · Flathead County, MT

Forest Road over Doris Creek

Carries Forest Road over Doris Creek, West Side Southfork.

Overall conditionFair

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

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

Elevation

Side view, colored by inspection rating
20 FT ACROSS25 FT0ELEVATION · LENGTHS TO SCALE
Culvert 6/9

A culvert 20 ft across. Lengths are drawn to scale; at this length a semi-truck would be a speck. Each part is colored by its latest inspection rating. The inventory records lengths but not heights, so those are drawn as typical for a culvert.

Built197650 years old
Length20.3 ft6.2 m
Daily traffic500counted 1992
Last inspectedJuly 2024every 24 months

Location

StateMontana
CountyFlathead
LocationWest Side Southfork
CarriesForest Road
CrossesDoris Creek
Coordinates48.30371, -113.98356

Physical Characteristics

MaterialSteel
DesignCulvert
Total Length20.3 ft (6.2 m)
Max Span20.3 ft (6.2 m)
Deck Area34.1 sq m
Main Spans1
Year Built1976

Traffic

Avg Daily Traffic500 (1992)
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2024
Inspection FrequencyEvery 24 months
OwnerU.S. Forest Service
Historical SignificanceHistorical significance is not determined
Scour Critical7 — Countermeasures installed
Structure Number011006000001095

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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