Washtenaw County Bridge Report Card

Washtenaw County scores 32 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

F32 / 100

Local infrastructure snapshot

Washtenaw County, Michigan

Washtenaw County has 262 bridges in the National Bridge Inventory, with 47 rated poor and 31 rated scour-critical. Its poor-condition share of 17.9% is above the 11.0% statewide average. Poor-condition bridges carry about 467,886 daily vehicle crossings.

262Total Bridges

47Poor (17.9%)

151Fair (57.6%)

31Scour-Critical

Quote-Ready Local Facts

17.9%of county bridges are in poor condition, compared with 11.0% statewide and 6.7% nationally.

467,886daily vehicle crossings are on poor-condition bridges in the county.

31bridges are rated scour-critical, or 11.8% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Washtenaw County a Bridge Condition Exposure Score of 32/100 (F). The county has 262 bridges in the National Bridge Inventory, including 47 in poor condition and 31 rated scour-critical. Poor-condition bridges carry about 467,886 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	17.9%	35.9
Poor-condition traffic exposure	25	15.1% of measured traffic	11.3
Scour-critical bridge share	20	11.8%	20.0
Average age vs national baseline	10	50 years vs 48 nationally	0.9
Traffic-data completeness	5	3,106,171 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	17.9%
State Poor-Condition Share	11.0%
National Poor-Condition Share	6.7%
County Scour-Critical Share	11.8%
Average Bridge Age	50 years
Poor-Condition Traffic Exposure	467,886 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeUs-23nb I-94BL over Packard RD — 39,120 vehicles/day Oldest Listed BridgeMaple Road over Huron River — built in 1876 All County BridgesBrowse every bridge record in Washtenaw County.

Top Bridges to Watch in Washtenaw County

Bridge	Reason	Condition	Daily Traffic	Year Built
Us-12br M-17 over Huron River	Poor condition + traffic exposure	Poor	18,300	1912
Plymouth Road over Flemming Creek	Poor condition + traffic exposure	Poor	7,431	1981
Hack RD over Macon Creek	Poor condition + traffic exposure	Poor	163	1965
Sharon Valley RD over Raisin River	Poor condition + traffic exposure	Poor	151	1960
Arkona RD over Stonycreek	Poor condition + traffic exposure	Poor	146	1926
Sheridan Road over Iron Creek	Poor condition + traffic exposure	Poor	138	1960
Jerusalem Road over Mill Creek	Poor condition + traffic exposure	Poor	129	1974
Sager RD over Mill Creek	Poor condition + traffic exposure	Poor	97	1962
Us-23nb I-94BL over Packard RD	Poor condition + traffic exposure	Poor	39,120	1962
Us-23sb I-94BL over Packard RD	Poor condition + traffic exposure	Poor	39,120	1962

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.