Loading 624,191 bridges... give or take a few.
Loading 624,191 bridges... give or take a few.
Infrastructure Grade
Infrastructure Report Card
7.4% of bridges in poor condition
Total Bridges
5,235
Poor Condition
388(7.4%)
Avg Bridge Age
48 yrs
Trend
Stable
| Metric | Montana | National Avg | Trend |
|---|---|---|---|
| % Poor Condition | 7.4% | 6.7% | Stable |
| vs. National Average | +0.7 pts | -- | -- |
| Average Bridge Age | 48 yrs | 48 yrs | -- |
| Good or Better | 2,688(51.3%) | -- | -- |
Grade Scale
Percentage of bridges in poor condition over time. The dashed line shows the national average for comparison.
Total Bridges
5,235
Poor Condition
388(7.4%)
Average Age
48 yrs
Daily Crossings
8.6M
Good or Better
2,688(51.3%)
These bridges have at least one major component rated "5" (Fair) — one step above the poor threshold. Sorted by daily traffic to highlight highest-impact structures at risk.
| Bridge | Location | Deck | Super | Sub | Daily Traffic |
|---|---|---|---|---|---|
| N RESERVE ST | Missoula County | 6 | 5 | 7 | 35,914 |
| US 93 | Flathead County | 5 | 8 | 6 | 25,919 |
| MADISON ST-US 12 | Missoula County | 7 | 6 | 5 | 18,393 |
| I 90 | Gallatin County | 6 | 7 | 5 | 15,554 |
| I 90 | Gallatin County | 6 | 5 | 6 | 15,554 |
| I 90 | Gallatin County | 6 | 7 | 5 | 15,554 |
| US 93 | Ravalli County | 5 | 7 | 7 | 14,573 |
| 15TH ST N-US 87 | Cascade County | 5 | 6 | 5 | 14,369 |
| 6TH ST SW | Cascade County | 5 | 8 | 7 | 13,800 |
| IRR - US 2 | Flathead County | 5 | 5 | 6 | 13,680 |
| IRR - US 2 | Flathead County | 5 | 5 | 6 | 13,680 |
| US 87-MT 3-MT 200 | Cascade County | 5 | 6 | 6 | 13,666 |
| US 89-MT 3-MT 200 | Cascade County | 5 | 6 | 6 | 13,666 |
| I 90 | Yellowstone County | 7 | 5 | 6 | 12,397 |
| I 90 | Deer Lodge County | 5 | 5 | 6 | 11,628 |
The 10 bridges in poorest condition, ranked by lowest sufficiency rating.
over MISSOURI RIVER 019
over DODSON SOUTH CANAL 116
over ROSS FORK CREEK 018
over PABLO 3A CANAL 037
over SWAN RIVER 110
over JEFFERSON RIVER 063
over BIG HOLE RIVER 041
over IRRIGATION DITCH 005
over SIXTEENMILE CREEK 039
over LITTLE CASINO CREEK 138
States with similar infrastructure profiles, ranked by percentage of bridges in poor condition.
Grading: Grades are based on the percentage of bridges classified as "poor condition." A bridge is in poor condition when at least one major component (deck, superstructure, or substructure) is rated 4 or below on the NBI 0-9 scale.
Data Source: Federal Highway Administration (FHWA) National Bridge Inventory (NBI). Data is updated annually. BridgeStats is not affiliated with or endorsed by the FHWA.
Watchlist Criteria: Bridges with any component rated "5" (Fair) are one step from the poor threshold of 4 and are flagged for monitoring. These bridges are not yet in poor condition but may deteriorate without maintenance.