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Irr Bia Rte 191 over Two Medicine Creek

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

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

Irr Bia Rte 191 over Two Medicine Creek in Glacier 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 1969, making it 56 years old at the 2025 inventory.
It carries about 50 vehicles a day (traffic count year 2023).
It is one of 3 of the 71 inventoried bridges in Glacier County rated poor (4.2%); 3 (4.2%) 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.

Component ratings


Structure	Timber stringer or multi-beam girder
Length	about 174 ft
Location	Below Lwr 2 Medicine Dam
NBI structure number	00000000000C120
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
Irr - US 2 over RR	1997	3,716	Good
Irr - US 2 over Cut Bank Creek	2007	3,523	Fair
Irr - US 2 over RR	1997	2,515	Good
Irr - US 89 over St Marys River	1956	2,355	Fair
Going-to-the-sun R over St. Mary River	1934	2,300	Fair
Going-to-the-sun R over Divide Creek	1934	2,300	Fair