Structure I00094010+01951 · Yellowstone County, MT

I 94 over S 8th RD

Carries I 94 over S 8th RD, 3.7m E Huntley.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructuresets the rating6/9 · Satisfactory
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT79 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 6/9 · sets the ratingSubstructure 7/9

79 ft end to end, longest span 30 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 slab bridge.

Built196759 years old
Length79.1 ft24.1 m
Daily traffic3,045counted 2023
Last inspectedDecember 2024every 24 months

Location

StateMontana
CountyYellowstone
Location3.7m E Huntley
CarriesI 94
CrossesS 8th RD
Coordinates45.91268, -108.23725

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length79.1 ft (24.1 m)
Max Span29.9 ft (9.1 m)
Deck Width41.0 ft (12.5 m)
Deck Area301.2 sq m
Main Spans3
Year Built1967

Traffic

Avg Daily Traffic3,045 (2023)
Truck Traffic22%
Lanes On Bridge2
Lanes Under Bridge2

Inspection & Ownership

Last InspectionDecember 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure NumberI00094010+01951

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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