Clay County Bridge Report Card

Clay County scores 63 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

D63 / 100

Local infrastructure snapshot

Clay County, South Dakota

Clay County has 93 bridges in the National Bridge Inventory, with 14 rated poor and 2 rated scour-critical. Its poor-condition share of 15.1% is at or below the 16.1% statewide average. Poor-condition bridges carry about 1,413 daily vehicle crossings.

93Total Bridges

14Poor (15.1%)

41Fair (44.1%)

2Scour-Critical

Quote-Ready Local Facts

15.1%of county bridges are in poor condition, compared with 16.1% statewide and 6.7% nationally.

1,413daily vehicle crossings are on poor-condition bridges in the county.

2bridges are rated scour-critical, or 2.2% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Clay County a Bridge Condition Exposure Score of 63/100 (D). The county has 93 bridges in the National Bridge Inventory, including 14 in poor condition and 2 rated scour-critical. Poor-condition bridges carry about 1,413 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	15.1%	30.1
Poor-condition traffic exposure	25	3.1% of measured traffic	2.3
Scour-critical bridge share	20	2.2%	4.3
Average age vs national baseline	10	41 years vs 48 nationally	0.0
Traffic-data completeness	5	46,136 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	15.1%
State Poor-Condition Share	16.1%
National Poor-Condition Share	6.7%
County Scour-Critical Share	2.2%
Average Bridge Age	41 years
Poor-Condition Traffic Exposure	1,413 vehicles/day

Bridges to Watch

Busiest Poor-Condition Bridge700 S. Dakota Ave. over Vermillion Rv — 550 vehicles/day Oldest Listed Bridge46080 314 St. over Clay Ck Ditch — built in 1900 All County BridgesBrowse every bridge record in Clay County.

Top Bridges to Watch in Clay County

Bridge	Reason	Condition	Daily Traffic	Year Built
700 S. Dakota Ave. over Vermillion Rv	Poor condition + traffic exposure	Poor	550	1975
46230 306 St. over Vermillion Rv Overflow	Poor condition + traffic exposure	Poor	150	1970
45530 306 Street over Ck	Poor condition + traffic exposure	Poor	147	1971
46080 313 St. over Clay Ck	Poor condition + traffic exposure	Poor	125	1983
46080 314 St. over Clay Ck Ditch	Poor condition + traffic exposure	Poor	97	1900
46530 314th St. over Vermillion Rv	Poor condition + traffic exposure	Poor	97	1930
46540 307th St. over Baptist Ck	Poor condition + traffic exposure	Poor	97	1940
46580 313 St. over Vermillion Rv	Poor condition + traffic exposure	Poor	40	1910
31500 455 AVE over Yankton Clay Ditch	Poor condition + traffic exposure	Poor	25	1938
29830 Ash Crk Ave. over Ash Ck	Poor condition + traffic exposure	Poor	25	1945

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.