Old US Hwy 91 over Little Muddy Creek 090

Cascade County, Montana · rated Poor in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

• Old US Hwy 91 over Little Muddy Creek 090 in Cascade County, Montana, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the deck, rated 4 (poor condition) on the 0-9 scale.
• It was built in 1923, making it 102 years old at the 2025 inventory.
• It carries about 100 vehicles a day (traffic count year 2025).
• Its listed owner is the state highway agency.
• It is one of 11 of the 185 inventoried bridges in Cascade County rated poor (5.9%); 11 (5.9%) are rated poor.
• A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

View this bridge on a map → (47.34093, -111.60911)

Component ratings

Bridge details

Source: FHWA National Bridge Inventory, 2025 data as reported by the Montana department of transportation.

Busiest bridges in Cascade County

All bridges nearby: Cascade County, MT bridge conditions · every bridge in Cascade County · Montana bridges.

Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.