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Irr - US 93 over Flathead River

Lake County, Montana · rated Fair in the 2025 National Bridge Inventory

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

Irr - US 93 over Flathead River in Lake County, Montana, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1966, making it 59 years old at the 2025 inventory.
It carries about 8,557 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 33 of the 116 inventoried bridges in Lake County rated fair (28.4%); 13 (11.2%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 1,536 ft
Location	Polson
NBI structure number	P00005061+01811
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
Irr - US 93 over Pablo Feeder Canal	2006	15,997	Good
US 93 over Wildlife Crossing	2007	10,897	Good
US 93 over Wildlife Crossing	2007	10,897	Good
US 93 over Agricultural Crossing	2007	10,897	Good
Irr - US 93 over Jocko River	2005	8,775	Good
US 93 over Spring Creek	2006	8,775	Good