Structure L25241000+00301 · Lewis and Clark County, MT

Frontage Road 241 over Little Prickly Pear 059

Carries Frontage Road 241 over Little Prickly Pear 059, Wolf Creek.

Overall conditionGood

Set by its lowest-rated component: Superstructure and Substructure at 7 of 9.

How ratings work
Deck8/9 · Very Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT90 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 7/9 · sets the ratingSubstructure 7/9 · sets the rating

90 ft end to end, longest span 70 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.

Built1966rebuilt 2022
Length89.9 ft27.4 m
Daily traffic711counted 2023
Last inspectedJuly 2023every 24 months

Location

StateMontana
CountyLewis and Clark
LocationWolf Creek
CarriesFrontage Road 241
CrossesLittle Prickly Pear 059
Coordinates47.00534, -112.07068

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length89.9 ft (27.4 m)
Max Span69.9 ft (21.3 m)
Deck Width36.4 ft (11.1 m)
Deck Area304.1 sq m
Main Spans3
Year Built1966 (reconstructed 2022)

Traffic

Avg Daily Traffic711 (2023)
Truck Traffic3%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure NumberL25241000+00301

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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