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Bridge conditions in Iosco County, Michigan

47 inventoried bridges · 3 rated poor · 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

Iosco County tracks close to typical: 3 of its 47 inventoried bridges (6.4%) are rated poor, against a national rate of about 7%.

3 of the 47 bridges in Iosco County, Michigan, are rated in poor condition (6.4%) in the 2025 National Bridge Inventory, as of August 20, 2026.
12 bridges (25.5%) are rated good and 32 (68.1%) fair.
The median Iosco County bridge was built in 1978.
The busiest poor-rated bridge is M-65 over Johnson Creek (built 1950), carrying about 4,353 vehicles a day.

Good 25.5% · Fair 68.1% · Poor 6.4% of 47 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
M-65 over Johnson Creek	1950	4,353	Poor
M-55 over E Br Au Gres River	1954	3,110	Poor
Shellenbarger Road over Smith Creek	1950	220	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
US-23 over Tawas River	1984	15,836	Fair
F 41 over Van Ettan Creek	1979	12,300	Fair
US-23 over Au Sable River	1972	8,367	Fair
M-55\|hemlock St over Tawas River	1950	8,047	Fair
M-65 over Hale Creek	1952	6,737	Fair
US-23 over Private Road	1931	5,497	Fair
River Road over Au Sable River	1963	4,920	Fair
M-65 over Johnson Creek	1950	4,353	Poor
Monument Rd over Tawas River	1981	4,030	Fair
M-65 over Au Gres River	1951	3,354	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.