Ingham County Bridge Report Card

Ingham County scores 44 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

F44 / 100

Local infrastructure snapshot

Ingham County, Michigan

Ingham County has 241 bridges in the National Bridge Inventory, with 30 rated poor and 23 rated scour-critical. Its poor-condition share of 12.4% is above the 11.0% statewide average. Poor-condition bridges carry about 430,469 daily vehicle crossings.

241Total Bridges

30Poor (12.4%)

171Fair (71.0%)

23Scour-Critical

Quote-Ready Local Facts

12.4%of county bridges are in poor condition, compared with 11.0% statewide and 6.7% nationally.

430,469daily vehicle crossings are on poor-condition bridges in the county.

23bridges are rated scour-critical, or 9.5% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Ingham County a Bridge Condition Exposure Score of 44/100 (F). The county has 241 bridges in the National Bridge Inventory, including 30 in poor condition and 23 rated scour-critical. Poor-condition bridges carry about 430,469 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	12.4%	24.9
Poor-condition traffic exposure	25	13.6% of measured traffic	10.2
Scour-critical bridge share	20	9.5%	19.1
Average age vs national baseline	10	53 years vs 48 nationally	1.9
Traffic-data completeness	5	3,170,816 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	12.4%
State Poor-Condition Share	11.0%
National Poor-Condition Share	6.7%
County Scour-Critical Share	9.5%
Average Bridge Age	53 years
Poor-Condition Traffic Exposure	430,469 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeI-496 WB over Us-127 SB — 39,163 vehicles/day Oldest Listed BridgeDennis Road over West Cedar Drain — built in 1900 All County BridgesBrowse every bridge record in Ingham County.

Top Bridges to Watch in Ingham County

Bridge	Reason	Condition	Daily Traffic	Year Built
M-43 over Red Cedar River	Poor condition + traffic exposure	Poor	13,900	1924
M-36 over Sycamore Creek	Poor condition + traffic exposure	Poor	5,910	1918
E Elm Street over Red Cedar River	Poor condition + traffic exposure	Poor	2,000	1980
Dennis Road over West Cedar Drain	Poor condition + traffic exposure	Poor	250	1900
W Wallace Street over Deer Creek	Poor condition + traffic exposure	Poor	10	1945
I-496 WB over Us-127 SB	Poor condition + traffic exposure	Poor	39,163	1970
I-496 EB over Red Cedar River & Ramp V	Poor condition + traffic exposure	Poor	34,831	1970
I-496 EB over Csx Rr & Trowbridge Rmp	Poor condition + traffic exposure	Poor	34,668	1963
I-496 EB over Gtw Rr	Poor condition + traffic exposure	Poor	34,668	1963
I-496EB & Us-127sb over I-96 WB	Poor condition + traffic exposure	Poor	29,356	1966

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.