Miner County Bridge Report Card

Miner County scores 48 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

F48 / 100

Local infrastructure snapshot

Miner County, South Dakota

Miner County has 63 bridges in the National Bridge Inventory, with 19 rated poor and 0 rated scour-critical. Its poor-condition share of 30.2% is above the 16.1% statewide average. Poor-condition bridges carry about 1,478 daily vehicle crossings.

63Total Bridges

19Poor (30.2%)

25Fair (39.7%)

0Scour-Critical

Quote-Ready Local Facts

30.2%of county bridges are in poor condition, compared with 16.1% statewide and 6.7% nationally.

1,478daily 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 Miner County a Bridge Condition Exposure Score of 48/100 (F). The county has 63 bridges in the National Bridge Inventory, including 19 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 1,478 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	30.2%	40.0
Poor-condition traffic exposure	25	14.0% of measured traffic	10.5
Scour-critical bridge share	20	0.0%	0.0
Average age vs national baseline	10	52 years vs 48 nationally	1.6
Traffic-data completeness	5	10,560 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	30.2%
State Poor-Condition Share	16.1%
National Poor-Condition Share	6.7%
County Scour-Critical Share	0.0%
Average Bridge Age	52 years
Poor-Condition Traffic Exposure	1,478 vehicles/day

Bridges to Watch

Busiest Poor-Condition Bridge222 ST over Redstone Ck — 320 vehicles/day Oldest Listed Bridge427 AVE over Rock Ck — built in 1901 All County BridgesBrowse every bridge record in Miner County.

Top Bridges to Watch in Miner County

Bridge	Reason	Condition	Daily Traffic	Year Built
222 ST over Redstone Ck	Poor condition + traffic exposure	Poor	320	1963
242 ST over West Fork Vermillion Rv	Poor condition + traffic exposure	Poor	250	1972
County RD over Rock Ck	Poor condition + traffic exposure	Poor	228	1930
222 ST over West Redstone Ck	Poor condition + traffic exposure	Poor	148	1930
427 AVE over Rock Ck	Poor condition + traffic exposure	Poor	75	1901
227 ST over Ck	Poor condition + traffic exposure	Poor	61	1925
428 AVE over Ck	Poor condition + traffic exposure	Poor	61	1940
226 ST over E Fork Vermillion Rv	Poor condition + traffic exposure	Poor	60	2000
421 AVE over Redstone Ck	Poor condition + traffic exposure	Poor	50	1930
434 AVE over West Fork Vermillion Rv	Poor condition + traffic exposure	Poor	40	1940

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.