Lawrence County Bridge Report Card

Lawrence County scores 71 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

C71 / 100

Local infrastructure snapshot

Lawrence County, South Dakota

Lawrence County has 136 bridges in the National Bridge Inventory, with 16 rated poor and 2 rated scour-critical. Its poor-condition share of 11.8% is at or below the 16.1% statewide average. Poor-condition bridges carry about 11,960 daily vehicle crossings.

136Total Bridges

16Poor (11.8%)

67Fair (49.3%)

2Scour-Critical

Quote-Ready Local Facts

11.8%of county bridges are in poor condition, compared with 16.1% statewide and 6.7% nationally.

11,960daily vehicle crossings are on poor-condition bridges in the county.

2bridges are rated scour-critical, or 1.5% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Lawrence County a Bridge Condition Exposure Score of 71/100 (C). The county has 136 bridges in the National Bridge Inventory, including 16 in poor condition and 2 rated scour-critical. Poor-condition bridges carry about 11,960 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	11.8%	23.5
Poor-condition traffic exposure	25	3.0% of measured traffic	2.2
Scour-critical bridge share	20	1.5%	2.9
Average age vs national baseline	10	44 years vs 48 nationally	0.0
Traffic-data completeness	5	404,209 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	11.8%
State Poor-Condition Share	16.1%
National Poor-Condition Share	6.7%
County Scour-Critical Share	1.5%
Average Bridge Age	44 years
Poor-Condition Traffic Exposure	11,960 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeGrant Street over Spearfish Ck — 3,981 vehicles/day Oldest Listed BridgeElmore RD over Spearfish Ck — built in 1901 All County BridgesBrowse every bridge record in Lawrence County.

Top Bridges to Watch in Lawrence County

Bridge	Reason	Condition	Daily Traffic	Year Built
I-90 Service Road over Crow Ck	Poor condition + traffic exposure	Poor	1,500	1940
900006: Peterson over Whitewood Creek	Poor condition + traffic exposure	Poor	25	2011
Grant Street over Spearfish Ck	Poor condition + traffic exposure	Poor	3,981	1988
County RD 014b over Miller Ck	Poor condition + traffic exposure	Poor	2,000	1934
Us014a over Ice Box Ck	Poor condition + traffic exposure	Poor	1,725	1964
Whitewood Service over County RD Rc P&e Rr	Poor condition + traffic exposure	Poor	500	1937
Camp Comfort Road over Spearfish Ck	Poor condition + traffic exposure	Poor	500	1975
Nemo Road over Boxelder Ck	Poor condition + traffic exposure	Poor	425	1974
I-90 Service Road over Spring Ck	Poor condition + traffic exposure	Poor	335	1938
Nemo Road over Boxelder Ck	Poor condition + traffic exposure	Poor	300	1975

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.