Structure I00094118+07361 · Rosebud County, MT

I 94 over Graveyard Creek

Carries I 94 over Graveyard Creek, 1m E Hathaway.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT83 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 6/9 · sets the rating

83 ft end to end, longest span 41 ft. 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.

Built1962rebuilt 1980
Length82.7 ft25.2 m
Daily traffic2,636counted 2023
Last inspectedJune 2023every 24 months

Location

StateMontana
CountyRosebud
Location1m E Hathaway
CarriesI 94
CrossesGraveyard Creek
Coordinates46.27992, -106.17949

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length82.7 ft (25.2 m)
Max Span41.0 ft (12.5 m)
Deck Width47.2 ft (14.4 m)
Deck Area362.9 sq m
Main Spans2
Year Built1962 (reconstructed 1980)

Traffic

Avg Daily Traffic2,636 (2023)
Truck Traffic21%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJune 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure NumberI00094118+07361

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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