Bridge conditions in Gallatin County, Montana
212 inventoried bridges · 12 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
12 of the 212 bridges the federal inventory lists in Gallatin County are rated poor; the rest split 43 good and 157 fair.
- 12 of the 212 bridges in Gallatin County, Montana, are rated in poor condition (5.7%) in the 2025 National Bridge Inventory, as of .
- 43 bridges (20.3%) are rated good and 157 (74.1%) fair.
- The median Gallatin County bridge was built in 1971.
- The busiest poor-rated bridge is I 90 over Abandoned RR (built 1969), carrying about 8,575 vehicles a day.
Good 20.3% · Fair 74.1% · Poor 5.7% of 212 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 90 over Abandoned RR | 1969 | 8,575 | Poor |
| US 191 Fh 42 over Teepee Creek | 1962 | 2,605 | Poor |
| US 191 over Grayling Creek | 1962 | 2,605 | Poor |
| W Dry Creek Rd over Baker Creek | 1967 | 1,287 | Poor |
| Axtell Anceny Rd over Gallatin River 084 | 1919 | 569 | Poor |
| Old Town Rd over Jefferson River 004 | 1897 | 100 | Poor |
| Kelly Canyon Rd over Bridger Creek 047 | 1983 | 100 | Poor |
| Maiden Rock Rd over Bridger Creek 107 | 1922 | 100 | Poor |
| Maiden Rock Rd over Bridger Creek 106 | 1940 | 100 | Poor |
| Old Town Rd over Jefferson River 063 | 1894 | 100 | Poor |
| Stagecoach Trl Rd over Baker Creek 082 | 1959 | 100 | Poor |
| Taylor Fork Road over Wapiti Creek | 1954 | 50 | Poor |
Busiest bridges in the county
| 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 |
| I 90 over Sep Valley Center Spur | 1966 | 15,554 | Fair |
| I 90 over Sep E Valley Center Spur | 1966 | 15,554 | Fair |
| S 84-norris Rd over Gallatin River | 1987 | 10,845 | Fair |
| E Kagy Blvd over Bozeman Creek | 1984 | 10,757 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Montana: Montana bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.