Structure P00060094+08282 · Cascade County, MT

US 89-mt 3-mt 200 over Missouri River-u5205-rr

Carries US 89-mt 3-mt 200 over Missouri River-u5205-rr, Great Falls-10th AVE S.

Overall conditionFair

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

How ratings work
Decksets the rating5/9 · Fair
Superstructure6/9 · Satisfactory
Substructure6/9 · Satisfactory
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT2,092 FT OVERALL250 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 6/9Substructure 6/9

2,092 ft end to end, longest span 185 ft: about 5.8 football fields. 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 girder bridge.

Built195175 years old
Length2092.2 ft637.7 m
Daily traffic13,666counted 2023
Last inspectedAugust 2023every 24 months

Location

StateMontana
CountyCascade
LocationGreat Falls-10th AVE S
CarriesUS 89-mt 3-mt 200
CrossesMissouri River-u5205-rr
Coordinates47.49336, -111.31157

Physical Characteristics

MaterialSteel Continuous
DesignGirder and Floorbeam
Total Length2092.2 ft (637.7 m)
Max Span185.0 ft (56.4 m)
Deck Width35.8 ft (10.9 m)
Deck Area6950.9 sq m
Main Spans6
Year Built1951

Traffic

Avg Daily Traffic13,666 (2023)
Truck Traffic2%
Lanes On Bridge2
Lanes Under Bridge2

Inspection & Ownership

Last InspectionAugust 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure NumberP00060094+08282

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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