Bridge conditions in Keweenaw County, Michigan
12 inventoried bridges · 1 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Keweenaw County tracks close to typical: 1 of its 12 inventoried bridges (8.3%) are rated poor, against a national rate of about 7%.
- 1 of the 12 bridges in Keweenaw County, Michigan, are rated in poor condition (8.3%) in the 2025 National Bridge Inventory, as of .
- 4 bridges (33.3%) are rated good and 7 (58.3%) fair.
- The median Keweenaw County bridge was built in 1959.
- The busiest poor-rated bridge is Cliff Drive over Gratiot River (built 1935), carrying about 128 vehicles a day.
Good 33.3% · Fair 58.3% · Poor 8.3% of 12 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 |
|---|---|---|---|
| Cliff Drive over Gratiot River | 1935 | 128 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US-41 M-26 over Gratiot River | 1953 | 3,430 | Good |
| US-41 over East Branch Eagle River | 1932 | 1,399 | Fair |
| M-26 over Silver River | 2023 | 1,100 | Good |
| US-41 over Fanny Hooe Creek | 1928 | 899 | Fair |
| M-26 over Central Creek | 1988 | 849 | Fair |
| M-26 over Eagle River | 1987 | 849 | Fair |
| M-26 over Owls Creek Buried | 1948 | 849 | Good |
| Lac La Belle Rd over Montreal River | 1942 | 558 | Fair |
| Cliff Drive over Gratiot River | 1935 | 128 | Poor |
| Gay Laclabelle Rd over Little Gratiot River | 1959 | 126 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Michigan: Michigan 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.