S 324 over Int Horse Prairie I 15

Fair Condition64 years old396 vehicles/day

Location

StateMontana
CountyBeaverhead
Location1m E Clark Canyon Dam
CarriesS 324
CrossesInt Horse Prairie I 15
Coordinates44.99894, -112.85373

Condition Ratings

Overall ConditionFair
Deck7 (Good)
Superstructure7 (Good)
Substructure6 (Satisfactory)
Scour CriticalNot applicable

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length234.9 ft (71.6 m)
Max Span76.4 ft (23.3 m)
Deck Width26.9 ft (8.2 m)
Deck Area587.1 sq m
Main Spans4
Year Built1962 (reconstructed 1979)

Traffic

Avg Daily Traffic396 (2023)
Truck Traffic1%
Lanes On Bridge2
Lanes Under Bridge4

Inspection & Ownership

Last Inspection125
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Structure NumberS00324000+00011

Nearby Bridges

S 324 over Clark Canyon Dam Splwy 0.4 mi Fair I 15 over Beaverhead River 0.5 mi Fair I 15 over Beaverhead River 0.5 mi Fair I 15 over Beaverhd R-high Brdg RD 1.5 mi Fair I 15 over Beaverhd R-high Brdg RD 1.5 mi Fair S 324 over Horse Prairie Creek 3.7 mi Fair I 15 over Sep High Bridge RD 4.3 mi Fair I 15 over Sep High Bridge RD 4.3 mi Fair Hennaberry RD over Beaverhead River 125 4.3 mi Good S 324 over Medicine Lodge Creek 4.5 mi Fair