Bridge conditions in Isabella County, Michigan
183 inventoried bridges · 26 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Isabella County has 26 bridges rated poor out of 183 inventoried, a 14.2% share that puts it well above the national rate of about 7%.
- 26 of the 183 bridges in Isabella County, Michigan, are rated in poor condition (14.2%) in the 2025 National Bridge Inventory, as of .
- 85 bridges (46.4%) are rated good and 72 (39.3%) fair.
- The median Isabella County bridge was built in 1980.
- The busiest poor-rated bridge is US-127 NB over Chippewa River (built 1961), carrying about 8,658 vehicles a day.
Good 46.4% · Fair 39.3% · Poor 14.2% of 183 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 |
|---|---|---|---|
| US-127 NB over Chippewa River | 1961 | 8,658 | Poor |
| US-127 SB over East River Rd | 1961 | 8,625 | Poor |
| Mission Road over Lewis Drain | 1930 | 6,140 | Poor |
| Mission Road over Spring Creek | 1935 | 5,200 | Poor |
| Weidman Road over Coldwater River | 1966 | 3,604 | Poor |
| US-127 Br NB over US-127 SB | 1961 | 2,953 | Poor |
| Rosebush Road over North Br Salt River | 1971 | 1,740 | Poor |
| River Rd over Coldwater River | 1964 | 1,637 | Poor |
| Meridian Road over North Br Chippewa River | 1934 | 1,420 | Poor |
| Rosebush Road over North Branch Salt River | 1966 | 798 | Poor |
| Airline Road over South Br Chippewa River | 1974 | 693 | Poor |
| Vernon Rd over US-127 | 1965 | 443 | Poor |
| Loomis Road over Chippewa River | 1974 | 441 | Poor |
| E County Line Road over Potter Creek | 1979 | 220 | Poor |
| Walton Road over Little Salt River | 1980 | 198 | Poor |
| Weidman Road over Spring Creek | 1981 | 196 | Poor |
| Baseline Road over Coldwater River | 1903 | 192 | Poor |
| Denver Road over North Br Salt River | 1937 | 185 | Poor |
| Summerton Road over Contrib S Br Salt River | 1937 | 185 | Poor |
| Denver Road over North Br Chippewa River | 1937 | 123 | Poor |
| Beckley Road over Pine River | 1969 | 121 | Poor |
| Leaton Road over Jordan Creek | 1970 | 100 | Poor |
| Shepherd Rd over Sharps Creek | 1969 | 85 | Poor |
| Vernon Rd over Sharps Creek | 1969 | 85 | Poor |
| Wyman Road over South Br Chippewa River | 1941 | 81 | Poor |
| Millbrook Road over Pony Creek | 1939 | 56 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Pickard Avenue over Chippewa River | 1979 | 16,211 | Fair |
| M-20 over Chippewa River | 1996 | 10,842 | Good |
| US-127 NB over Little Salt River | 1961 | 10,457 | Fair |
| US-127 SB over Little Salt River | 1961 | 10,457 | Fair |
| Mission Road over Ann Arbor Railroad | 2005 | 9,200 | Good |
| Mission Road over North Br Chippewa River | 2008 | 9,019 | Good |
| US-127 NB over Chippewa River | 1961 | 8,658 | Poor |
| US-127 SB over Chippewa River | 1961 | 8,658 | Fair |
| US-127 SB over Lewis Drain | 1961 | 8,625 | Fair |
| US-127 NB over Lewis Drain | 1961 | 8,625 | 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.