Structure 11404000000165 · Lincoln County, MT

473 Keeler/rattle over N F Keeler CR

Carries 473 Keeler/rattle over N F Keeler CR, Just Past Jct With 404.

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 overall6/9 · Satisfactory
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.

Built197650 years old
Length55.1 ft16.8 m
Daily traffic25counted 1994
Last inspectedSeptember 2024every 24 months

Location

StateMontana
CountyLincoln
LocationJust Past Jct With 404
Carries473 Keeler/rattle
CrossesN F Keeler CR
Coordinates48.34449, -115.90207

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length55.1 ft (16.8 m)
Max Span50.9 ft (15.5 m)
Deck Width16.4 ft (5 m)
Deck Area84 sq m
Main Spans1
Year Built1976

Traffic

Avg Daily Traffic25 (1994)
Lanes On Bridge1

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 24 months
OwnerU.S. Forest Service
Historical SignificanceHistorical significance is not determined
Scour Critical5 — Stable for scour
Structure Number011404000000165

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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