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I 15 over Int Divide-hwy 43

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

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

I 15 over Int Divide-hwy 43 in Silver Bow 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 7 (good condition) on the 0-9 scale.
It was built in 1976, making it 49 years old at the 2025 inventory.
It carries about 2,283 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 11 of the 70 inventoried bridges in Silver Bow County rated good (15.7%); 2 (2.9%) 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 152 ft
Location	Divide
NBI structure number	I00015102+04872
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
I 15 over Bell Creek	1963	19,755	Fair
I-90 E&w over Abandoned Railroad	2019	15,011	Good
S Montana St over Silver Bow Creek	1970	14,718	Fair
I 15 over Int Rocker	1968	10,824	Fair
I 15 over Int Rocker	1968	10,824	Fair
I 90 over Whitetail Creek	1965	10,349	Fair