Calhoun County Bridge Report Card

Calhoun County scores 39 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

F39 / 100

Local infrastructure snapshot

Calhoun County, Michigan

Calhoun County has 213 bridges in the National Bridge Inventory, with 37 rated poor and 25 rated scour-critical. Its poor-condition share of 17.4% is above the 11.0% statewide average. Poor-condition bridges carry about 83,634 daily vehicle crossings.

213Total Bridges

37Poor (17.4%)

133Fair (62.4%)

25Scour-Critical

Quote-Ready Local Facts

17.4%of county bridges are in poor condition, compared with 11.0% statewide and 6.7% nationally.

83,634daily vehicle crossings are on poor-condition bridges in the county.

25bridges are rated scour-critical, or 11.7% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Calhoun County a Bridge Condition Exposure Score of 39/100 (F). The county has 213 bridges in the National Bridge Inventory, including 37 in poor condition and 25 rated scour-critical. Poor-condition bridges carry about 83,634 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	17.4%	34.7
Poor-condition traffic exposure	25	6.0% of measured traffic	4.5
Scour-critical bridge share	20	11.7%	20.0
Average age vs national baseline	10	52 years vs 48 nationally	1.8
Traffic-data completeness	5	1,390,752 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	17.4%
State Poor-Condition Share	11.0%
National Poor-Condition Share	6.7%
County Scour-Critical Share	11.7%
Average Bridge Age	52 years
Poor-Condition Traffic Exposure	83,634 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeM-89 over Wabascon Creek — 14,726 vehicles/day Oldest Listed BridgeMarshall Avenue over Rice Creek — built in 1899 All County BridgesBrowse every bridge record in Calhoun County.

Top Bridges to Watch in Calhoun County

Bridge	Reason	Condition	Daily Traffic	Year Built
25.5 Mi Road over Kalamazoo River	Poor condition + traffic exposure	Poor	2,991	1948
9 Mile Road over ST Joseph River	Poor condition + traffic exposure	Poor	580	1968
10 Mile Road over Nottawassepee Creek	Poor condition + traffic exposure	Poor	459	1976
12 Mile Road over Nottawassepee Creek	Poor condition + traffic exposure	Poor	439	1919
R Drive South over ST Joseph River	Poor condition + traffic exposure	Poor	78	1973
H Drive South over Nottawa Creek	Poor condition + traffic exposure	Poor	61	1918
J Drive South over Nottawa Creek	Poor condition + traffic exposure	Poor	43	1919
M-89 over Wabascon Creek	Poor condition + traffic exposure	Poor	14,726	1947
17 Mile Road over I-94	Poor condition + traffic exposure	Poor	13,254	1960
M-89 (washington) over Battle Creek River	Poor condition + traffic exposure	Poor	11,004	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.