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Irr - US 89 over Birch Creek

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

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

Irr - US 89 over Birch Creek in Pondera County, Montana, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1965, making it 60 years old at the 2025 inventory.
It carries about 1,012 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 43 of the 96 inventoried bridges in Pondera County rated fair (44.8%); 4 (4.2%) 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 213 ft
Location	14M W Valier
NBI structure number	P00003085+04811
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
I 15 over S Pondera Coulee	1964	3,248	Fair
I 15 over RR	1972	1,727	Good
I 15 over RR	1972	1,727	Good
I 15 over Dry Fork Marias River	1972	1,727	Good
I 15 over Dry Fork Marias River	1972	1,727	Good
S 21 over RR	1972	1,725	Good