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Bridge conditions in Monroe County, Michigan

299 inventoried bridges · 40 rated poor · 2025 National Bridge Inventory

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

Of the 299 Monroe County bridges in the federal inventory, 40 carry a poor rating. That 13.4% share is roughly 2x the national average.

40 of the 299 bridges in Monroe County, Michigan, are rated in poor condition (13.4%) in the 2025 National Bridge Inventory, as of August 20, 2026.
93 bridges (31.1%) are rated good and 166 (55.5%) fair.
The median Monroe County bridge was built in 1973.
The busiest poor-rated bridge is I-75 over Conrail Raisin R Front (built 1955), carrying about 67,800 vehicles a day.

Good 31.1% · Fair 55.5% · Poor 13.4% of 299 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 over Conrail Raisin R Front	1955	67,800	Poor
US-24 over Stony Creek	1931	19,500	Poor
US-23 NB over Indiana & Ohio RR	1958	16,733	Poor
US-24 over Indian Creek	1925	11,702	Poor
US-24 over Otter Creek	1924	7,446	Poor
Laplaisance Road over Laplaisance Creek	1988	7,130	Poor
North Custer Rd over Willow Run	1928	6,582	Poor
Sterns Rd over US-23	1959	6,030	Poor
M-125 over Indian Creek	1934	5,815	Poor
I-75 Conn over NS & Gtw RR	1938	3,200	Poor
Ida West Rd over US-23	1958	2,070	Poor
Deerfield Rd over River Raisin	1963	1,920	Poor
War Road over Stony Creek	1982	1,550	Poor
Dennison Road over North Macon Creek	1929	1,250	Poor
Sigler Rd over Swan Creek	1972	850	Poor
Ready Rd over I-75	1956	680	Poor
Consear Rd over US-23	1959	530	Poor
Labo Rd over I-275	1973	500	Poor
Ottawa Lake Road over Ottawa Lake Drain	1900	480	Poor
Hicker Road over Ottawa Lake Outlet	1960	440	Poor
Dennison Rd over South Branch Macon Drain	1983	366	Poor
Knab Rd over Otter Creek	1964	360	Poor
Rauch Rd over US-23	1959	330	Poor
Stoneybrook Lane over Indian Creek	1979	323	Poor
Kelly Road over Muddy Creek	1986	280	Poor
Sigler Rd over I-75	1954	270	Poor
Todd Road over Lockwood Drain	1979	260	Poor
Maxwell Road over Swan Creek	1960	240	Poor
Goutz Road over Otter Creek	1977	230	Poor
Sweitzer Road over Swan Creek	1982	220	Poor
Bay Creek Road over Bay Creek	1971	220	Poor
Kruse Road over Lockwood Drain	1980	220	Poor
Lenawee Road over Swamp Raisin Creek	1960	198	Poor
S Otter Creek Road over Lockwood Drain	1930	130	Poor
Lenawee Co Line Rd over Milan-macon Drain	1929	110	Poor
Allison Road over Saline River	1961	100	Poor
Snell Road over Saline River	1993	65	Poor
Bragg Road over Swamp Raisin Creek	1930	50	Poor
N County Line Road over North Macon Creek	1910	30	Poor
Day Road over Saline River	1937	16	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
I-75 over Conrail Raisin R Front	1955	67,800	Poor
I-75 over NS & Cn Railroad	1956	65,200	Good
I-75 over Norfolk Southern RR	1955	65,200	Fair
I-75 over Sandy Creek Rd	1955	65,200	Fair
I-75 over Paper Co Water Mains	1955	63,962	Fair
I-75 over Norfolk Southern RR	1955	63,962	Fair
I-75 over Cn Gtw & NS Rrs	1954	63,766	Fair
I-75 over Little Lake Creek	2020	58,900	Good
I-75 over Sulphur Creek	2024	58,600	Good
I-75 (NB Ex Ramp) over Laplaisance Creek	1975	51,000	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.