Structure 11504000000023 · Judith Basin County, MT

Nfsr #487 over S Fk Judith River

Carries Nfsr #487 over S Fk Judith River, 19 Mi SW Of Utica.

Overall conditionPoor

Set by its lowest-rated component: Substructure at 4 of 9.

How ratings work
Deck6/9 · Satisfactory
Superstructure7/9 · Good
Substructuresets the rating4/9 · Poor
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT28 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 7/9Substructure 4/9 · sets the rating

28 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.

Built195868 years old
Length27.9 ft8.5 m
Daily traffic65counted 2001
Last inspectedSeptember 2024every 24 months

Location

StateMontana
CountyJudith Basin
Location19 Mi SW Of Utica
CarriesNfsr #487
CrossesS Fk Judith River
Coordinates46.78977, -110.30020

Physical Characteristics

MaterialWood or Timber
DesignStringer/Multi-beam
Total Length27.9 ft (8.5 m)
Max Span26.9 ft (8.2 m)
Deck Width15.1 ft (4.6 m)
Deck Area39.1 sq m
Main Spans1
Year Built1958

Traffic

Avg Daily Traffic65 (2001)
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 Number011504000000023

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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