Charles Mix County Bridge Report Card

Charles Mix County scores 47 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

F47 / 100

Local infrastructure snapshot

Charles Mix County, South Dakota

Charles Mix County has 103 bridges in the National Bridge Inventory, with 24 rated poor and 4 rated scour-critical. Its poor-condition share of 23.3% is above the 16.1% statewide average. Poor-condition bridges carry about 1,229 daily vehicle crossings.

103Total Bridges

24Poor (23.3%)

40Fair (38.8%)

4Scour-Critical

Quote-Ready Local Facts

23.3%of county bridges are in poor condition, compared with 16.1% statewide and 6.7% nationally.

1,229daily vehicle crossings are on poor-condition bridges in the county.

4bridges are rated scour-critical, or 3.9% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Charles Mix County a Bridge Condition Exposure Score of 47/100 (F). The county has 103 bridges in the National Bridge Inventory, including 24 in poor condition and 4 rated scour-critical. Poor-condition bridges carry about 1,229 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	23.3%	40.0
Poor-condition traffic exposure	25	3.6% of measured traffic	2.7
Scour-critical bridge share	20	3.9%	7.8
Average age vs national baseline	10	54 years vs 48 nationally	2.6
Traffic-data completeness	5	34,344 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	23.3%
State Poor-Condition Share	16.1%
National Poor-Condition Share	6.7%
County Scour-Critical Share	3.9%
Average Bridge Age	54 years
Poor-Condition Traffic Exposure	1,229 vehicles/day

Bridges to Watch

Busiest Poor-Condition Bridge30010 400th Avenue over Choteau Creek — 205 vehicles/day Oldest Listed Bridge39740 296th Street over Creek — built in 1912 All County BridgesBrowse every bridge record in Charles Mix County.

Top Bridges to Watch in Charles Mix County

Bridge	Reason	Condition	Daily Traffic	Year Built
30010 400th Avenue over Choteau Creek	Poor condition + traffic exposure	Poor	205	1958
39740 296th Street over Creek	Poor condition + traffic exposure	Poor	48	1912
37570 287 Street over Pease Ck	Poor condition + traffic exposure	Poor	48	1920
39120 305th Street over Mosquito Creek	Poor condition + traffic exposure	Poor	48	1920
29110 393rd Avenue over Creek	Poor condition + traffic exposure	Poor	48	1925
38710 294th Street over Creek	Poor condition + traffic exposure	Poor	48	1930
38890 286th Street over Andes Creek	Poor condition + traffic exposure	Poor	48	1930
29620 396th Avenue over Choteau Creek	Poor condition + traffic exposure	Poor	48	1930
38080 291st Street over Creek	Poor condition + traffic exposure	Poor	48	1935
38450 292nd Street over Creek	Poor condition + traffic exposure	Poor	48	1935

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.