Ionia County Bridge Report Card

Ionia County scores 54 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

F54 / 100

Local infrastructure snapshot

Ionia County, Michigan

Ionia County has 118 bridges in the National Bridge Inventory, with 12 rated poor and 11 rated scour-critical. Its poor-condition share of 10.2% is at or below the 11.0% statewide average. Poor-condition bridges carry about 36,169 daily vehicle crossings.

118Total Bridges

12Poor (10.2%)

69Fair (58.5%)

11Scour-Critical

Quote-Ready Local Facts

10.2%of county bridges are in poor condition, compared with 11.0% statewide and 6.7% nationally.

36,169daily vehicle crossings are on poor-condition bridges in the county.

11bridges are rated scour-critical, or 9.3% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Ionia County a Bridge Condition Exposure Score of 54/100 (F). The county has 118 bridges in the National Bridge Inventory, including 12 in poor condition and 11 rated scour-critical. Poor-condition bridges carry about 36,169 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	10.2%	20.3
Poor-condition traffic exposure	25	7.6% of measured traffic	5.7
Scour-critical bridge share	20	9.3%	18.6
Average age vs national baseline	10	51 years vs 48 nationally	1.2
Traffic-data completeness	5	472,999 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	10.2%
State Poor-Condition Share	11.0%
National Poor-Condition Share	6.7%
County Scour-Critical Share	9.3%
Average Bridge Age	51 years
Poor-Condition Traffic Exposure	36,169 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeI-96 WB over Portland RD — 19,963 vehicles/day Oldest Listed BridgeWhites Bridge RD over Flat River — built in 1867 All County BridgesBrowse every bridge record in Ionia County.

Top Bridges to Watch in Ionia County

Bridge	Reason	Condition	Daily Traffic	Year Built
M-21 over Prairie Creek	Poor condition + traffic exposure	Poor	8,456	1929
M-21 over Maple River	Poor condition + traffic exposure	Poor	2,533	1929
Grand River Avenue over Libhart Creek	Poor condition + traffic exposure	Poor	1,093	1936
Borden RD over Prairie Creek	Poor condition + traffic exposure	Poor	462	1927
I-96 WB over Portland RD	Poor condition + traffic exposure	Poor	19,963	1958
Divine Highway over Lookingglass River	Poor condition + traffic exposure	Poor	2,494	1979
Nickle Plate RD over Maple River Flood	Poor condition + traffic exposure	Poor	404	1983
Jackson Road over Unnamed Creek	Poor condition + traffic exposure	Poor	321	1993
Reeder Road over Libhart Creek	Poor condition + traffic exposure	Poor	152	1975
Peck Lake Road over Libhart Creek	Poor condition + traffic exposure	Poor	128	1982

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.