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I 15 Frontage Rd over Basin Creek 041

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

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

I 15 Frontage Rd over Basin Creek 041 in Jefferson 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 1985, making it 40 years old at the 2025 inventory.
It carries about 100 vehicles a day (traffic count year 2025).
Its listed owner is the state highway agency.
It is one of 7 of the 136 inventoried bridges in Jefferson County rated poor (5.1%); 7 (5.1%) 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 62 ft
Location	Basin
NBI structure number	L22099008+09001
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 Prickly Pear Creek	1969	5,987	Fair
I 15 over Prickly Pear Creek	1969	5,987	Fair
S 518 over Int Montana City-i 15	1968	5,885	Good
I 90 over Int Cardwell-s 359	1968	5,599	Fair
I 90 over Int Cardwell-s 359	1968	5,599	Fair
I 90 Eastbound over Boulder River	1968	5,599	Good