Lyon County Bridge Report Card

Lyon County scores 87 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

B87 / 100

Local infrastructure snapshot

Lyon County, Minnesota

Lyon County has 234 bridges in the National Bridge Inventory, with 6 rated poor and 9 rated scour-critical. Its poor-condition share of 2.6% is at or below the 4.5% statewide average. Poor-condition bridges carry about 713 daily vehicle crossings.

234Total Bridges

6Poor (2.6%)

51Fair (21.8%)

9Scour-Critical

Quote-Ready Local Facts

2.6%of county bridges are in poor condition, compared with 4.5% statewide and 6.7% nationally.

713daily vehicle crossings are on poor-condition bridges in the county.

9bridges are rated scour-critical, or 3.8% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Lyon County a Bridge Condition Exposure Score of 87/100 (B). The county has 234 bridges in the National Bridge Inventory, including 6 in poor condition and 9 rated scour-critical. Poor-condition bridges carry about 713 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	2.6%	5.1
Poor-condition traffic exposure	25	0.5% of measured traffic	0.3
Scour-critical bridge share	20	3.8%	7.7
Average age vs national baseline	10	42 years vs 48 nationally	0.0
Traffic-data completeness	5	154,062 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	2.6%
State Poor-Condition Share	4.5%
National Poor-Condition Share	6.7%
County Scour-Critical Share	3.8%
Average Bridge Age	42 years
Poor-Condition Traffic Exposure	713 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeCsah 11 over Stream — 517 vehicles/day Oldest Listed BridgeMn 19 over Stream — built in 1919 All County BridgesBrowse every bridge record in Lyon County.

Top Bridges to Watch in Lyon County

Bridge	Reason	Condition	Daily Traffic	Year Built
Csah 11 over Stream	Poor condition + traffic exposure	Poor	517	1938
M 5 over Redwood River	Poor condition + traffic exposure	Poor	60	1976
T 112 over S Br Yellow Medicine R	Poor condition + traffic exposure	Poor	51	1966
CR 69 over Big Cottonwood River	Poor condition + traffic exposure	Poor	36	1959
M 20 over S Br Yellow Medicine R	Poor condition + traffic exposure	Poor	25	1925
T 263 over Redwood River	Poor condition + traffic exposure	Poor	24	1969
Csah 11 over Big Cottonwood River	Scour-critical foundation rating	Fair	960	1964
Csah 10 over Stream	Scour-critical foundation rating	Fair	445	1963
Csah 8 over S Br Yellow Medicine R	Scour-critical foundation rating	Good	295	1970
Csah 13 over S Br Yellow Medicine R	Scour-critical foundation rating	Fair	65	1967

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.