Butte County Bridge Report Card

Butte 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

Butte County, South Dakota

Butte County has 142 bridges in the National Bridge Inventory, with 20 rated poor and 6 rated scour-critical. Its poor-condition share of 14.1% is at or below the 16.1% statewide average. Poor-condition bridges carry about 981 daily vehicle crossings.

142Total Bridges

20Poor (14.1%)

76Fair (53.5%)

6Scour-Critical

Quote-Ready Local Facts

14.1%of county bridges are in poor condition, compared with 16.1% statewide and 6.7% nationally.

981daily vehicle crossings are on poor-condition bridges in the county.

6bridges are rated scour-critical, or 4.2% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Butte County a Bridge Condition Exposure Score of 63/100 (D). The county has 142 bridges in the National Bridge Inventory, including 20 in poor condition and 6 rated scour-critical. Poor-condition bridges carry about 981 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	14.1%	28.2
Poor-condition traffic exposure	25	1.1% of measured traffic	0.9
Scour-critical bridge share	20	4.2%	8.5
Average age vs national baseline	10	48 years vs 48 nationally	0.0
Traffic-data completeness	5	86,494 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	14.1%
State Poor-Condition Share	16.1%
National Poor-Condition Share	6.7%
County Scour-Critical Share	4.2%
Average Bridge Age	48 years
Poor-Condition Traffic Exposure	981 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeArpan RD over South Canal — 269 vehicles/day Oldest Listed BridgeDiversion Dam Road over Inlet Canal — built in 1906 All County BridgesBrowse every bridge record in Butte County.

Top Bridges to Watch in Butte County

Bridge	Reason	Condition	Daily Traffic	Year Built
Arpan RD over South Canal	Poor condition + traffic exposure	Poor	269	1975
Old HWY 212 over Station Elm Ck	Poor condition + traffic exposure	Poor	48	1945
Gaver Road over Redwater Rv	Poor condition + traffic exposure	Poor	47	1920
Brooker RD over Indian Ck	Poor condition + traffic exposure	Poor	47	1950
Eicher RD over Horse Ck	Poor condition + traffic exposure	Poor	47	1950
Old HWY 212 over Ck	Poor condition + traffic exposure	Poor	47	1950
Winkler RD over Horse Ck	Poor condition + traffic exposure	Poor	47	1958
Ypparilla RD over Ck	Poor condition + traffic exposure	Poor	47	1960
Old HWY 212 over Dry Ck	Poor condition + traffic exposure	Poor	47	1970
Youngberg Road over Horse Ck	Poor condition + traffic exposure	Poor	47	1978

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.