Bridge conditions in St. Clair County, Michigan
326 inventoried bridges · 31 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
31 of the 326 bridges the federal inventory lists in St. Clair County are rated poor; the rest split 130 good and 165 fair.
- 31 of the 326 bridges in St. Clair County, Michigan, are rated in poor condition (9.5%) in the 2025 National Bridge Inventory, as of .
- 130 bridges (39.9%) are rated good and 165 (50.6%) fair.
- The median St. Clair County bridge was built in 1985.
- The busiest poor-rated bridge is I-94 WB over M-25 Conn (built 1964), carrying about 21,619 vehicles a day.
Good 39.9% · Fair 50.6% · Poor 9.5% of 326 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-94 WB over M-25 Conn | 1964 | 21,619 | Poor |
| Yale Road over S Br Mill Creek Drain | 1989 | 2,602 | Poor |
| Shea Road over Beaubien Creek Drain | 1963 | 2,500 | Poor |
| Griswold Road over Pine River | 1990 | 2,030 | Poor |
| Anchor Bay Drive over Unnamed Canal | 1980 | 1,655 | Poor |
| Sparling Road over Pine River | 1988 | 1,390 | Poor |
| Broadbridge Road over Marine City Dredge Cut | 1986 | 1,100 | Poor |
| Yale Road over Eves Drain | 1922 | 980 | Poor |
| Allen Rd over I-69 | 1966 | 883 | Poor |
| Allington Rd over I-94 | 1964 | 690 | Poor |
| Bates Highway over Maybury Cut Canal | 1987 | 580 | Poor |
| Goodells Road over Unnamed Creek | 1920 | 475 | Poor |
| Braidwood Road over Belle River | 1940 | 430 | Poor |
| Long Island Court over Unnamed Canal | 1982 | 350 | Poor |
| Miller Street over Unnamed Canal | 1956 | 252 | Poor |
| Arnold Road over Beaubien Creek Drain | 1967 | 250 | Poor |
| Plank Road over Beaubien Creek Drain | 1988 | 250 | Poor |
| Mill St over Sage Creek | 1970 | 250 | Poor |
| Palms Road over Unnamed Creek | 1983 | 187 | Poor |
| North Street Road over Milwaukee Creek | 1982 | 185 | Poor |
| Palms Road over Smiths Creek | 1932 | 180 | Poor |
| Comstock Road over Eves Drain | 1939 | 179 | Poor |
| Puttygut Road over Belle River | 1992 | 159 | Poor |
| Imlay City Road over Whackenbush Drain | 1978 | 155 | Poor |
| Kitchen Road over Unnamed Creek | 1982 | 150 | Poor |
| Bryce Road over Emmett Drain | 1981 | 135 | Poor |
| Wilkes Road over Mill Creek | 1980 | 120 | Poor |
| Bryce Road over Pine River | 1923 | 115 | Poor |
| Lashbrook Road over Unnamed Creek | 1979 | 105 | Poor |
| Cogley Road over Emmett Drain | 1958 | 59 | Poor |
| Masters Road over Belle River | 1935 | 53 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-94 over Stocks Creek Drain | 2011 | 50,660 | Good |
| I-94 & I-69 over M-25 Pine Grove Ave | 1993 | 43,238 | Good |
| M-25 over Black River Spillway | 2000 | 40,250 | Fair |
| I-94 over Stocks Creek | 1964 | 29,650 | Fair |
| M-25 over Howe Drain | 1981 | 28,550 | Fair |
| I-94 & I-69 WB over Black River & Scott Ave | 2011 | 26,010 | Fair |
| I-94 EB over Belle River | 2009 | 25,000 | Good |
| I-94 WB over Belle River | 2009 | 25,000 | Fair |
| I-94 WB over M-25 Conn | 1964 | 21,619 | Poor |
| I-94/i-69 (WB) over EB I-94/i-69 on Ramp | 1992 | 21,619 | 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.