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Bridge conditions in Isabella County, Michigan

183 inventoried bridges · 26 rated poor · 2025 National Bridge Inventory

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

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 August 20, 2026.
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.

Every bridge in Isabella County → - all 183, busiest first, each with its own condition record.

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.