Structure 10901000000097 · Deer Lodge County, MT

Road 169 over Racetrack CR

Carries Road 169 over Racetrack CR, 1 Mile Before Campground.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructure8/9 · Very 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 FT33 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 8/9Substructure 6/9 · sets the rating

33 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.

Built198145 years old
Length32.8 ft10 m
Daily traffic502 lanes
Last inspectedDecember 2024every 24 months

Location

StateMontana
CountyDeer Lodge
Location1 Mile Before Campground
CarriesRoad 169
CrossesRacetrack CR
Coordinates46.27874, -112.91913

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length32.8 ft (10 m)
Max Span31.2 ft (9.5 m)
Deck Width28.5 ft (8.7 m)
Deck Area87 sq m
Main Spans1
Year Built1981

Traffic

Avg Daily Traffic50
Lanes On Bridge2

Inspection & Ownership

Last InspectionDecember 2024
Inspection FrequencyEvery 24 months
OwnerU.S. Forest Service
Historical SignificanceHistorical significance is not determined
Scour Critical7 — Countermeasures installed
Structure Number010901000000097

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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