Structure P00002067+09361 · Fallon County, MT

US 12 over Sandstone Creek

Carries US 12 over Sandstone Creek, 2m W Plevna.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructure7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT143 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

143 ft end to end, longest span 71 ft. Lengths and the semi-truck 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.

Built197155 years old
Length142.7 ft43.5 m
Daily traffic498counted 2023
Last inspectedOctober 2024every 24 months

Location

StateMontana
CountyFallon
Location2m W Plevna
CarriesUS 12
CrossesSandstone Creek
Coordinates46.41447, -104.57094

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length142.7 ft (43.5 m)
Max Span70.9 ft (21.6 m)
Deck Width40.4 ft (12.3 m)
Deck Area535.0 sq m
Main Spans2
Year Built1971

Traffic

Avg Daily Traffic498 (2023)
Truck Traffic12%
Lanes On Bridge2

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure NumberP00002067+09361

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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