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Irr - US 89 over Blacktail Creek

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

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

Irr - US 89 over Blacktail Creek in Pondera 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 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 4 of the 96 inventoried bridges in Pondera County rated poor (4.2%); 4 (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	Prestressed concrete stringer or multi-beam girder
Length	about 145 ft
Location	16M NW Valier
NBI structure number	P00003087+03951
Condition class	Poor

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