Structure P00005029+02801 · Lake County, MT

US 93 over Grade Separation

Carries US 93 over Grade Separation, 2m N Ravalli.

Overall conditionFair

Set by its lowest-rated component: Deck at 5 of 9.

How ratings work
Decksets the rating5/9 · Fair
Superstructure8/9 · Very Good
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT67 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 8/9Substructure 7/9

67 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.

Built200620 years old
Length66.6 ft20.3 m
Daily traffic7,746counted 2023
Last inspectedJune 2023every 24 months

Location

StateMontana
CountyLake
Location2m N Ravalli
CarriesUS 93
CrossesGrade Separation
Coordinates47.29414, -114.15925

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length66.6 ft (20.3 m)
Max Span66.6 ft (20.3 m)
Deck Width84.0 ft (25.6 m)
Deck Area519.7 sq m
Main Spans1
Year Built2006

Traffic

Avg Daily Traffic7,746 (2023)
Truck Traffic5%
Lanes On Bridge4

Inspection & Ownership

Last InspectionJune 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure NumberP00005029+02801

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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