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Bridge conditions in Alpena County, Michigan

32 inventoried bridges · 2 rated poor · 2025 National Bridge Inventory

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

2 of the 32 bridges the federal inventory lists in Alpena County are rated poor; the rest split 11 good and 19 fair.

2 of the 32 bridges in Alpena County, Michigan, are rated in poor condition (6.2%) in the 2025 National Bridge Inventory, as of August 20, 2026.
11 bridges (34.4%) are rated good and 19 (59.4%) fair.
The median Alpena County bridge was built in 1971.
The busiest poor-rated bridge is M-65 over Thunder Bay River (built 1953), carrying about 1,861 vehicles a day.

Good 34.4% · Fair 59.4% · Poor 6.2% of 32 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 Thunder Bay River	1953	1,861	Poor
5LONG Rapids Road over N Br Thunder Bay River	1978	1,150	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
US-23 over Thunder Bay River	1932	16,200	Fair
Second Avenue over Thunder Bay River	1939	15,700	Fair
Bagley Street over Thunder Bay River	2021	15,000	Good
US-23 over S Br Devil River	1936	5,537	Fair
US-23 over N Br Devil River	1933	5,537	Fair
M-32 over Bean Creek	1934	5,505	Fair
M-32 over S Br Thunder Bay River	1931	5,505	Fair
Werth Road over Mud Creek	2019	5,325	Good
Ninth Avenue over Thunder Bay River	1971	5,123	Fair
US-23 over Long Lake Creek	1939	4,816	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.