IRR - I 90 over Bighorn River

Good Condition55 years old4,258 vehicles/day

Location

StateMontana
CountyBig Horn
LocationHardin
CarriesIRR - I 90
CrossesBighorn River
Coordinates45.73690, -107.57372

Condition Ratings

Overall ConditionGood
Deck7 (Good)
Superstructure7 (Good)
Substructure7 (Good)
Channel/Waterway7 (Good)
Scour Critical8 — Stable, low risk

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length593.5 ft (180.9 m)
Max Span195.9 ft (59.7 m)
Deck Width44.0 ft (13.4 m)
Deck Area2424.1 sq m
Main Spans3
Year Built1971

Traffic

Avg Daily Traffic4,258 (2023)
Truck Traffic18%
Lanes On Bridge2

Inspection & Ownership

Last Inspection723
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Structure NumberI00090498+01011

Nearby Bridges

IRR - I 90 over Bighorn River 0.0 mi Fair I 90 Frontage RD over Bighorn River 0.0 mi Fair I 90 over Irrigation Canal 0.4 mi Fair Irr-s 47-3rd ST E over Int E Hardin I 90 0.5 mi Fair IRR - I 90 over Sarpy Road-s 384 0.7 mi Fair IRR - I 90 over Sarpy Road-s 384 0.7 mi Fair Sarpy Creek RD over Little Bighorn River 0.8 mi Fair IRR - I 90 over Rr (not In Use) 1.4 mi Fair IRR - I 90 over Rr (not In Use) 1.4 mi Fair Irr-s 47 over Int W Hardin I 90 2.0 mi Fair