Monroe County Bridge Report Card

Monroe County scores 48 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

F48 / 100

Local infrastructure snapshot

Monroe County, Michigan

Monroe County has 299 bridges in the National Bridge Inventory, with 40 rated poor and 51 rated scour-critical. Its poor-condition share of 13.4% is above the 11.0% statewide average. Poor-condition bridges carry about 166,226 daily vehicle crossings.

299Total Bridges

40Poor (13.4%)

166Fair (55.5%)

51Scour-Critical

Quote-Ready Local Facts

13.4%of county bridges are in poor condition, compared with 11.0% statewide and 6.7% nationally.

166,226daily vehicle crossings are on poor-condition bridges in the county.

51bridges are rated scour-critical, or 17.1% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Monroe County a Bridge Condition Exposure Score of 48/100 (F). The county has 299 bridges in the National Bridge Inventory, including 40 in poor condition and 51 rated scour-critical. Poor-condition bridges carry about 166,226 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.

Download all county report-card scores as CSV.

How the Score Breaks Down

Factor	Weight	County Value	Penalty
Poor-condition bridge share	40	13.4%	26.8
Poor-condition traffic exposure	25	6.3% of measured traffic	4.7
Scour-critical bridge share	20	17.1%	20.0
Average age vs national baseline	10	50 years vs 48 nationally	1.0
Traffic-data completeness	5	2,626,988 measured daily crossings	0.0

Score = 100 minus weighted penalties. The score is a comparative research signal, not an official safety rating. Read the full methodology.

County Comparisons

County Poor-Condition Share	13.4%
State Poor-Condition Share	11.0%
National Poor-Condition Share	6.7%
County Scour-Critical Share	17.1%
Average Bridge Age	50 years
Poor-Condition Traffic Exposure	166,226 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeI-75 over Conrail Raisin R Front — 67,800 vehicles/day Oldest Listed BridgeCollins Road over North Macon Drain — built in 1897 All County BridgesBrowse every bridge record in Monroe County.

Top Bridges to Watch in Monroe County

Bridge	Reason	Condition	Daily Traffic	Year Built
I-75 over Conrail Raisin R Front	Poor condition + traffic exposure	Poor	67,800	1955
North Custer RD over Willow Run	Poor condition + traffic exposure	Poor	6,582	1928
Deerfield RD over River Raisin	Poor condition + traffic exposure	Poor	1,920	1963
War Road over Stony Creek	Poor condition + traffic exposure	Poor	1,550	1982
Dennison Road over North Macon Creek	Poor condition + traffic exposure	Poor	1,250	1929
Sigler RD over Swan Creek	Poor condition + traffic exposure	Poor	850	1972
Ottawa Lake Road over Ottawa Lake Drain	Poor condition + traffic exposure	Poor	480	1900
Knab RD over Otter Creek	Poor condition + traffic exposure	Poor	360	1964
Stoneybrook Lane over Indian Creek	Poor condition + traffic exposure	Poor	323	1979
Todd Road over Lockwood Drain	Poor condition + traffic exposure	Poor	260	1979

Important safety note

Poor condition does not mean a bridge is unsafe. It means at least one major component has significant deterioration and the bridge is a priority for maintenance, repair, or replacement. Bridges judged unsafe are closed or restricted by transportation agencies.