Old Ulm Cascade RD over Sep I 15

Good Condition49 years old100 vehicles/day

Location

StateMontana
CountyCascade
Location6m NE Cascade
CarriesOld Ulm Cascade RD
CrossesSep I 15
Coordinates47.34018, -111.62438

Condition Ratings

Overall ConditionGood
Deck7 (Good)
Superstructure8 (Very Good)
Substructure7 (Good)
Scour CriticalNot applicable

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length285.8 ft (87.1 m)
Max Span100.1 ft (30.5 m)
Deck Width29.9 ft (9.1 m)
Deck Area792.6 sq m
Main Spans4
Year Built1977

Traffic

Avg Daily Traffic100 (2025)
Truck Traffic3%
Lanes On Bridge2
Lanes Under Bridge4

Inspection & Ownership

Last Inspection324
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Structure NumberL07565000+06001

Nearby Bridges

Old US HWY 91 over Little Muddy Creek 090 0.7 mi Poor I 15 over Little Muddy Creek 0.7 mi Good I 15 over Little Muddy Creek 0.7 mi Good Old Ulm Cascade RD over Little Muddy Creek 067 1.1 mi Fair River RD over Bird Creek 036 3.3 mi Fair Sun R Cascade RD over Little Muddy Creek 040 4.1 mi Good Old Ulm Cascade RD over Sep I 15 4.3 mi Good Castner Falls RD over Bird Creek 038 4.4 mi Fair