Clark County Bridge Report Card

Clark County scores 90 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

A90 / 100

Local infrastructure snapshot

Clark County, South Dakota

Clark County has 21 bridges in the National Bridge Inventory, with 1 rated poor and 0 rated scour-critical. Its poor-condition share of 4.8% is at or below the 16.1% statewide average. Poor-condition bridges carry about 39 daily vehicle crossings.

21Total Bridges

1Poor (4.8%)

9Fair (42.9%)

0Scour-Critical

Quote-Ready Local Facts

4.8%of county bridges are in poor condition, compared with 16.1% statewide and 6.7% nationally.

39daily vehicle crossings are on poor-condition bridges in the county.

0bridges are rated scour-critical, or 0.0% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Clark County a Bridge Condition Exposure Score of 90/100 (A). The county has 21 bridges in the National Bridge Inventory, including 1 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 39 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	4.8%	9.5
Poor-condition traffic exposure	25	1.3% of measured traffic	0.9
Scour-critical bridge share	20	0.0%	0.0
Average age vs national baseline	10	36 years vs 48 nationally	0.0
Traffic-data completeness	5	3,105 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	4.8%
State Poor-Condition Share	16.1%
National Poor-Condition Share	6.7%
County Scour-Critical Share	0.0%
Average Bridge Age	36 years
Poor-Condition Traffic Exposure	39 vehicles/day

Bridges to Watch

Busiest Poor-Condition Bridge419th Avenue over Creek — 39 vehicles/day Oldest Listed Bridge418th Avenue over Creek — built in 1932 All County BridgesBrowse every bridge record in Clark County.

Top Bridges to Watch in Clark County

Bridge	Reason	Condition	Daily Traffic	Year Built
419th Avenue over Creek	Poor condition + traffic exposure	Poor	39	1983
414th Avenue over Creek	High traffic	Fair	450	1956
414th Avenue over Creek	High traffic	Fair	389	1956
Sd028 over Shue Ck	High traffic	Fair	302	2016
Sd028 over Br Shue Ck	High traffic	Fair	302	2016
414th Avenue over Creek	High traffic	Good	245	1956
414th Avenue over Fordham Creek	High traffic	Fair	236	1956
415th Avenue over Creek	High traffic	Fair	182	1949
415th Avenue over Creek	High traffic	Fair	176	1949
414th Avenue over Creek	High traffic	Good	158	1956

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.