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US 191 Fh 42 over West Gallatin River

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

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

US 191 Fh 42 over West Gallatin River in Gallatin 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 1959, making it 66 years old at the 2025 inventory.
It carries about 2,325 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 157 of the 212 inventoried bridges in Gallatin County rated fair (74.1%); 12 (5.7%) 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	Continuous concrete tee beam
Length	about 122 ft
Location	17M SE Big Sky
NBI structure number	P00050032+07581
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
N Seventh Ave over Int N 7TH Ave-i 90	2014	26,020	Fair
US 191-huffine Ln over Hyalite Creek	1956	25,670	Fair
N 19TH Ave over Int N 19TH Ave	1994	23,992	Fair
I 90 over Walking Path	2011	21,232	Fair
I 90 over Int Airway Blvd	2014	15,554	Fair
I 90 over Int Airway Blvd	2014	15,554	Fair