Aurora County Bridge Report Card

Aurora County scores 66 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

D66 / 100

Local infrastructure snapshot

Aurora County, South Dakota

Aurora County has 61 bridges in the National Bridge Inventory, with 7 rated poor and 2 rated scour-critical. Its poor-condition share of 11.5% is at or below the 16.1% statewide average. Poor-condition bridges carry about 393 daily vehicle crossings.

61Total Bridges

7Poor (11.5%)

29Fair (47.5%)

2Scour-Critical

Quote-Ready Local Facts

11.5%of county bridges are in poor condition, compared with 16.1% statewide and 6.7% nationally.

393daily vehicle crossings are on poor-condition bridges in the county.

2bridges are rated scour-critical, or 3.3% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Aurora County a Bridge Condition Exposure Score of 66/100 (D). The county has 61 bridges in the National Bridge Inventory, including 7 in poor condition and 2 rated scour-critical. Poor-condition bridges carry about 393 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	11.5%	23.0
Poor-condition traffic exposure	25	1.2% of measured traffic	0.9
Scour-critical bridge share	20	3.3%	6.6
Average age vs national baseline	10	56 years vs 48 nationally	3.4
Traffic-data completeness	5	32,920 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	11.5%
State Poor-Condition Share	16.1%
National Poor-Condition Share	6.7%
County Scour-Critical Share	3.3%
Average Bridge Age	56 years
Poor-Condition Traffic Exposure	393 vehicles/day

Bridges to Watch

Busiest Poor-Condition Bridge242 ST over Ck — 101 vehicles/day Oldest Listed Bridge242 ST over Ck — built in 1917 All County BridgesBrowse every bridge record in Aurora County.

Top Bridges to Watch in Aurora County

Bridge	Reason	Condition	Daily Traffic	Year Built
242 ST over Ck	Poor condition + traffic exposure	Poor	101	1917
265 ST over Platte Ck	Poor condition + traffic exposure	Poor	66	1967
246 ST over Firesteel Ck	Poor condition + traffic exposure	Poor	65	1930
378 AVE over West Firesteel Ck	Poor condition + traffic exposure	Poor	62	1936
391 AVE over West Firesteel Ck	Poor condition + traffic exposure	Poor	33	1925
244 ST over Firesteel Ck	Poor condition + traffic exposure	Poor	33	1940
383 AVE over West Firesteel Ck	Poor condition + traffic exposure	Poor	33	1973
Us281 over West Br Firesteel Ck	Scour-critical foundation rating	Fair	1,284	1959
243 ST over Ck	Scour-critical foundation rating	Fair	101	1924
I090 over Ck	High traffic	Fair	9,890	1965

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.