Douglas County Bridge Report Card

Douglas County scores 53 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

F53 / 100

Local infrastructure snapshot

Douglas County, South Dakota

Douglas County has 44 bridges in the National Bridge Inventory, with 7 rated poor and 1 rated scour-critical. Its poor-condition share of 15.9% is at or below the 16.1% statewide average. Poor-condition bridges carry about 1,177 daily vehicle crossings.

44Total Bridges

7Poor (15.9%)

18Fair (40.9%)

1Scour-Critical

Quote-Ready Local Facts

15.9%of county bridges are in poor condition, compared with 16.1% statewide and 6.7% nationally.

1,177daily vehicle crossings are on poor-condition bridges in the county.

1bridges are rated scour-critical, or 2.3% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Douglas County a Bridge Condition Exposure Score of 53/100 (F). The county has 44 bridges in the National Bridge Inventory, including 7 in poor condition and 1 rated scour-critical. Poor-condition bridges carry about 1,177 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	15.9%	31.8
Poor-condition traffic exposure	25	9.4% of measured traffic	7.1
Scour-critical bridge share	20	2.3%	4.5
Average age vs national baseline	10	57 years vs 48 nationally	3.5
Traffic-data completeness	5	12,461 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	15.9%
State Poor-Condition Share	16.1%
National Poor-Condition Share	6.7%
County Scour-Critical Share	2.3%
Average Bridge Age	57 years
Poor-Condition Traffic Exposure	1,177 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeIRR Us018 over Creek — 556 vehicles/day Oldest Listed Bridge40340 287 St. over Ck — built in 1912 All County BridgesBrowse every bridge record in Douglas County.

Top Bridges to Watch in Douglas County

Bridge	Reason	Condition	Daily Traffic	Year Built
IRR Us018 over Creek	Poor condition + traffic exposure	Poor	556	1961
39280 284 ST over Br Choteau Ck	Poor condition + traffic exposure	Poor	330	1925
38830 280 ST over Andes Ck	Poor condition + traffic exposure	Poor	206	1950
38840 278 ST over Andes Ck	Poor condition + traffic exposure	Poor	30	1972
39530 271 ST over Ck	Poor condition + traffic exposure	Poor	25	1980
40340 287 St. over Ck	Poor condition + traffic exposure	Poor	20	1912
27140 404 AVE over Ck	Poor condition + traffic exposure	Poor	10	1985
Sd044 over Andes Ck	Scour-critical foundation rating	Fair	1,516	1957
Sd044 over Br Choteau Ck	High traffic	Good	1,785	1960
Sd044 over Choteau Ck	High traffic	Fair	1,785	1961

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.