Structure I00094025+05972 · Yellowstone County, MT

I 94 over Fly Creek

Carries I 94 over Fly Creek, 2.5m E Pompeys Pillar.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructuresets the rating6/9 · Satisfactory
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 FT109 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 6/9Substructure 6/9

109 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.

Built197650 years old
Length108.9 ft33.2 m
Daily traffic2,255counted 2023
Last inspectedOctober 2024every 24 months

Location

StateMontana
CountyYellowstone
Location2.5m E Pompeys Pillar
CarriesI 94
CrossesFly Creek
Coordinates45.99350, -107.94708

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length108.9 ft (33.2 m)
Max Span29.9 ft (9.1 m)
Deck Width44.3 ft (13.5 m)
Deck Area448.2 sq m
Main Spans4
Year Built1976

Traffic

Avg Daily Traffic2,255 (2023)
Truck Traffic30%
Lanes On Bridge2

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure NumberI00094025+05972

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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