Structure U01027001+09601 · Yellowstone County, MT

Hilltop RD over Bbwa Canal

Carries Hilltop RD over Bbwa Canal, Billings-hilltop RD.

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 overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT42 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

42 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 tee-beam bridge.

Built1960rebuilt 2012
Length42.0 ft12.8 m
Daily traffic8,274counted 2023
Last inspectedDecember 2024every 24 months

Location

StateMontana
CountyYellowstone
LocationBillings-hilltop RD
CarriesHilltop RD
CrossesBbwa Canal
Coordinates45.81291, -108.47798

Physical Characteristics

MaterialPrestressed Concrete
DesignTee Beam
Total Length42.0 ft (12.8 m)
Max Span39.0 ft (11.9 m)
Deck Width59.4 ft (18.1 m)
Deck Area231.7 sq m
Main Spans1
Year Built1960 (reconstructed 2012)

Traffic

Avg Daily Traffic8,274 (2023)
Truck Traffic1%
Lanes On Bridge2

Inspection & Ownership

Last InspectionDecember 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure NumberU01027001+09601

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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