Charleston County Bridge Report Card

Charleston County scores 89 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

B89 / 100

Local infrastructure snapshot

Charleston County, South Carolina

Charleston County has 339 bridges in the National Bridge Inventory, with 9 rated poor and 4 rated scour-critical. Its poor-condition share of 2.7% is at or below the 6.3% statewide average. Poor-condition bridges carry about 240,050 daily vehicle crossings.

339Total Bridges

9Poor (2.7%)

189Fair (55.8%)

4Scour-Critical

Quote-Ready Local Facts

2.7%of county bridges are in poor condition, compared with 6.3% statewide and 6.7% nationally.

240,050daily vehicle crossings are on poor-condition bridges in the county.

4bridges are rated scour-critical, or 1.2% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Charleston County a Bridge Condition Exposure Score of 89/100 (B). The county has 339 bridges in the National Bridge Inventory, including 9 in poor condition and 4 rated scour-critical. Poor-condition bridges carry about 240,050 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	2.7%	5.3
Poor-condition traffic exposure	25	4.1% of measured traffic	3.1
Scour-critical bridge share	20	1.2%	2.4
Average age vs national baseline	10	37 years vs 48 nationally	0.0
Traffic-data completeness	5	5,840,165 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	2.7%
State Poor-Condition Share	6.3%
National Poor-Condition Share	6.7%
County Scour-Critical Share	1.2%
Average Bridge Age	37 years
Poor-Condition Traffic Exposure	240,050 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeI-26 over Rr Csxt — 94,100 vehicles/day Oldest Listed BridgeSc 162/highway 162 over Log Bridge Creek — built in 1921 All County BridgesBrowse every bridge record in Charleston County.

Top Bridges to Watch in Charleston County

Bridge	Reason	Condition	Daily Traffic	Year Built
Sc 7 over Ashley River	Poor condition + traffic exposure	Poor	47,800	1953
Sc 703 over Shem Creek	Poor condition + traffic exposure	Poor	37,500	1947
I-26 over Rr Csxt	Poor condition + traffic exposure	Poor	94,100	1963
US 17 NB over Ashley River	Poor condition + traffic exposure	Poor	38,250	1961
S-10-97 over Tidal Stream	Poor condition + traffic exposure	Poor	18,100	1972
S-390/toogoodoo RD over Swinton Creek	Poor condition + traffic exposure	Poor	1,750	1975
S-1632/old Pond RD over Simons Creek	Poor condition + traffic exposure	Poor	1,450	1969
S-10-40 over Rr Csxt	Poor condition + traffic exposure	Poor	750	1927
S-10-98 over Guerin Creek	Poor condition + traffic exposure	Poor	350	1974
S-10-1442 over Simmons Creek	Scour-critical foundation rating	Fair	5,400	1967

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.