Bridge conditions in Bay County, Michigan
166 inventoried bridges · 27 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Bay County has 27 bridges rated poor out of 166 inventoried, a 16.3% share that puts it well above the national rate of about 7%.
- 27 of the 166 bridges in Bay County, Michigan, are rated in poor condition (16.3%) in the 2025 National Bridge Inventory, as of .
- 46 bridges (27.7%) are rated good and 93 (56.0%) fair.
- The median Bay County bridge was built in 1968.
- The busiest poor-rated bridge is I-75 NB over Hesr (built 1960), carrying about 44,350 vehicles a day.
Good 27.7% · Fair 56.0% · Poor 16.3% of 166 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-75 NB over Hesr | 1960 | 44,350 | Poor |
| M-13 & M-84 over E Channel Saginaw River | 1938 | 16,380 | Poor |
| US-10 WB over E Patrick Rd(union Rd) | 1960 | 8,325 | Poor |
| Salzburg Rd over M-47 | 1966 | 2,670 | Poor |
| Wheeler Road over Kawkawlin River | 1962 | 2,429 | Poor |
| Garfield Rd over US-10 | 1958 | 2,030 | Poor |
| Mackinaw Road over Kawkawlin River | 1960 | 1,799 | Poor |
| Fraser St over Kawkawlin River | 1959 | 784 | Poor |
| Eight Mile Road over N Br Kawkawlin River | 1971 | 493 | Poor |
| Kaiser-tower Road over Fraser-garfield Drain | 1936 | 486 | Poor |
| Fraser Road over Pinconning River | 1935 | 393 | Poor |
| Eight Mile Road over Kawkawlin River | 1934 | 380 | Poor |
| Mackinaw Road over Selleck Drain | 1975 | 335 | Poor |
| Doud Road (parish) over N Br Kawkawlin River | 1972 | 316 | Poor |
| Nine Mile Road over Pinconning River | 1930 | 267 | Poor |
| Hotchkiss Rd over M-47 | 1966 | 260 | Poor |
| Fraser Road over Railroad Drain | 1937 | 220 | Poor |
| Erickson Road over N Br Kawkawlin River | 1942 | 172 | Poor |
| Stevenson Road over S Br Pine River | 1970 | 150 | Poor |
| Fraser Road over Whitefeather Creek | 1970 | 150 | Poor |
| Avalon Road over Private Channel | 1955 | 122 | Poor |
| Russell Road over Constant-durussell Drain | 1930 | 106 | Poor |
| Nolet Road over Quanicassee River | 1924 | 96 | Poor |
| Eight Mile Road over Kossick Drain | 1940 | 93 | Poor |
| Ausable State Road over Tebo Drain | 1948 | 75 | Poor |
| Hunter Road over Pinconning River | 1945 | 75 | Poor |
| Eight Mile Road over White Feather Creek | 1938 | 75 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-75 NB over Squaconning Creek | 1960 | 57,600 | Fair |
| I-75 SB over Squaconning Creek | 1960 | 57,600 | Fair |
| I-75 NB over Goetz Drain | 2010 | 53,002 | Good |
| I-75 NB over Hesr | 1960 | 44,350 | Poor |
| US-10 EB over Gtw RR | 1961 | 35,800 | Fair |
| US-10 WB over Gtw RR | 1961 | 35,800 | Fair |
| US-10 over Culver Drain | 1956 | 33,474 | Fair |
| M-25 over Cm RR | 1957 | 30,724 | Fair |
| M-13|m-84 over W Channel Saginaw River | 1938 | 25,874 | Fair |
| Truman Parkway over Water St & C&orr | 1976 | 25,340 | 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.