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Irr - US 89 over South Fork Milk River

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

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

Irr - US 89 over South Fork Milk River in Glacier County, Montana, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
It was built in 2022, making it 3 years old at the 2025 inventory.
It carries about 1,718 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 28 of the 71 inventoried bridges in Glacier County rated good (39.4%); 3 (4.2%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 73 ft
Location	48 39 05.40
NBI structure number	000000202206060
Condition class	Good

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