Marlboro County Bridge Report Card

Marlboro County scores 69 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

D69 / 100

Local infrastructure snapshot

Marlboro County, South Carolina

Marlboro County has 97 bridges in the National Bridge Inventory, with 7 rated poor and 0 rated scour-critical. Its poor-condition share of 7.2% is above the 6.3% statewide average. Poor-condition bridges carry about 38,250 daily vehicle crossings.

97Total Bridges

7Poor (7.2%)

55Fair (56.7%)

0Scour-Critical

Quote-Ready Local Facts

7.2%of county bridges are in poor condition, compared with 6.3% statewide and 6.7% nationally.

38,250daily 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 Marlboro County a Bridge Condition Exposure Score of 69/100 (D). The county has 97 bridges in the National Bridge Inventory, including 7 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 38,250 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	7.2%	14.4
Poor-condition traffic exposure	25	18.3% of measured traffic	13.7
Scour-critical bridge share	20	0.0%	0.0
Average age vs national baseline	10	54 years vs 48 nationally	2.6
Traffic-data completeness	5	209,575 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	7.2%
State Poor-Condition Share	6.3%
National Poor-Condition Share	6.7%
County Scour-Critical Share	0.0%
Average Bridge Age	54 years
Poor-Condition Traffic Exposure	38,250 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeSc 9 Bus over Crooked Creek — 10,100 vehicles/day Oldest Listed BridgeSc 9 Bus over Crooked Creek — built in 1921 All County BridgesBrowse every bridge record in Marlboro County.

Top Bridges to Watch in Marlboro County

Bridge	Reason	Condition	Daily Traffic	Year Built
Sc 9 Bus over Crooked Creek	Poor condition + traffic exposure	Poor	10,100	1921
Sc 9 over Phillis Creek	Poor condition + traffic exposure	Poor	8,300	1932
US 15 over Panther Creek	Poor condition + traffic exposure	Poor	7,600	1925
US 1 NB over Great Pee Dee River	Poor condition + traffic exposure	Poor	7,400	1962
Sc 9 SB over Naked Creek	Poor condition + traffic exposure	Poor	4,150	1975
Sc 83 over Little Pee Dee River	Poor condition + traffic exposure	Poor	550	1937
S-609 over Crooked Creek	Poor condition + traffic exposure	Poor	150	1978
Sc 9 over Crooked Creek	High traffic	Good	7,900	2010
US 15 over Beaver Dam Creek	High traffic	Fair	7,600	1939
Sc 38 over Three Creeks	High traffic	Fair	7,500	1994

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.