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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 August 20, 2026

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 August 20, 2026.
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.

Every bridge in St. Clair County → - all 326, 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.