Structure 11401000000133 · Lincoln County, MT

Steep Creek Road over Big Creek

Carries Steep Creek Road over Big Creek, Big CR.

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 FT51 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

51 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.

Built1963rebuilt 1995
Length50.9 ft15.5 m
Daily traffic401 lanes
Last inspectedAugust 2024every 24 months

Location

StateMontana
CountyLincoln
LocationBig CR
CarriesSteep Creek Road
CrossesBig Creek
Coordinates48.75602, -115.39501

Physical Characteristics

MaterialWood or Timber
DesignStringer/Multi-beam
Total Length50.9 ft (15.5 m)
Max Span48.9 ft (14.9 m)
Deck Width16.1 ft (4.9 m)
Deck Area76.0 sq m
Main Spans1
Year Built1963 (reconstructed 1995)

Traffic

Avg Daily Traffic40
Lanes On Bridge1

Inspection & Ownership

Last InspectionAugust 2024
Inspection FrequencyEvery 24 months
OwnerU.S. Forest Service
Historical SignificanceHistorical significance is not determined
Scour Critical5 — Stable for scour
Structure Number011401000000133

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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