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Scour-Critical Bridges in South Carolina

South Carolina has 1,217 bridges rated scour-critical by the Federal Highway Administration. These bridges have foundations that are unstable or at risk of undermining during flood events. Scour-critical doesn't mean a bridge is about to collapse — it means extra monitoring and countermeasures are in place — but these structures are priorities for repair or replacement.

How this ranking works

This state list filters to NBI scour ratings 0 through 3, then sorts by average daily traffic. It is intended to show flood-vulnerability exposure, not to label any bridge as currently unsafe.

BridgeCountyScour RatingDaily TrafficCondition
Sc 7 over Ashley RiverCharleston3 — Serious47,800Poor
I-77 NB over Gills CreekRichland3 — Serious42,500Good
I-77 SB over Gills CreekRichland3 — Serious42,500Good
Sc 703 over Shem CreekCharleston3 — Serious37,500Poor
I-95 Nbl over Savannah RiverJasper3 — Serious32,050Fair
I-95 Sbl over Savannah RiverJasper3 — Serious32,050Fair
US 76 over Gills CreekRichland3 — Serious29,800Fair
I-95 NB over Great SwampJasper3 — Serious29,700Fair
I-95 SB over Great SwampJasper3 — Serious29,700Fair
I-77 NB over S. Fork Fishing CkChester3 — Serious28,150Fair
I-26 EB over Cypress SwampBerkeley3 — Serious27,700Fair
I-26 WB over Cypress SwampBerkeley3 — Serious27,700Fair
I-26 EB over Cow Castle CreekOrangeburg3 — Serious27,250Fair
I-26 WB over Cow Castle CreekOrangeburg3 — Serious27,250Fair
S-23-107 over Laurel CreekGreenville3 — Serious27,000Fair
I-95 NB over Indian Field SwampDorchester3 — Serious25,800Fair
I-95 SB over Indian Field SwampDorchester3 — Serious25,800Fair
US 17 over Waccamaw RiverGeorgetown3 — Serious25,600Poor
I-77 Nbl over Big Wateree CkFairfield3 — Serious24,300Fair
I-77 Sbl over Big Wateree CkFairfield3 — Serious24,300Fair
US 52 over Jefferies CreekFlorence3 — Serious24,100Poor
I-26 EB over Four Hole SwampBerkeley3 — Serious23,550Fair
I-26 WB over Four Hole SwampBerkeley3 — Serious23,550Fair
I-95 NB over Great Pee Dee SwampDillon3 — Serious23,150Fair
I-95 SB over Great Pee Dee SwampDillon3 — Serious23,150Fair
I-95 NB over Poccosin SwampDillon3 — Serious23,150Fair
I-95 SB over Poccosin SwampDillon3 — Serious23,150Fair
I-95 NB over Gr. Pee Dee Swp & F-rdFlorence3 — Serious23,150Fair
I-95 SB over Gr. Pee Dee Swp & F-rdFlorence3 — Serious23,150Fair
I-95 NB over Great Pee Dee RiverFlorence3 — Serious23,150Poor
I-95 SB over Great Pee Dee RiverFlorence3 — Serious23,150Fair
US 501 over Waccamaw Riv Sclrr L-123Horry3 — Serious22,700Fair
Sc 51 over Jeffries CreekFlorence3 — Serious21,400Good
I-26 EB over Indian CreekNewberry3 — Serious20,850Fair
I-26 WB over Indian CreekNewberry3 — Serious20,850Poor
US 17 Alt over Ashley RiverDorchester3 — Serious19,800Poor
I-95 SB over Jefferies CreekFlorence3 — Serious18,750Fair
I-95 NB over Lake SwampFlorence3 — Serious18,450Fair
I-95 SB over Lake SwampFlorence3 — Serious18,450Fair
I-20 EB over South Edisto RiverAiken3 — Serious18,200Fair
I-20 WB over South Edisto RiverAiken3 — Serious18,200Fair
I-95 NB over Pocotaligo Swamp (no. 3)Clarendon3 — Serious18,100Fair
I-95 SB over Pocotaligo Swamp (no. 3)Clarendon3 — Serious18,100Fair
I-95 NB over Providence SwampOrangeburg3 — Serious17,900Fair
I-95 SB over Providence SwampOrangeburg3 — Serious17,900Fair
I-20 EB over N. Edisto RiverAiken3 — Serious17,800Fair
I-20 WB over N. Edisto RiverAiken3 — Serious17,800Fair
I-95 NB over Lynches RiverFlorence3 — Serious17,050Fair
I-95 SB over Lynches RiverFlorence3 — Serious17,050Fair
I-95 NB over Tearcoat BranchClarendon3 — Serious16,300Fair
I-95 SB over Tearcoat BranchClarendon3 — Serious16,300Fair
I-95 NB over Black River (no. 2)Clarendon3 — Serious16,300Fair
I-95 NB over Black Swamp (no. 5)Clarendon3 — Serious16,300Fair
I-95 SB over Black Swamp (no. 3)Clarendon3 — Serious16,300Fair
I-95 SB over Black Swamp (no. 5)Clarendon3 — Serious16,300Fair
S-40-129 over Nicholas CreekRichland3 — Serious16,100Good
US 52 over Lynches LakeFlorence3 — Serious15,900Fair
Sc 9 Sbl over Waccamaw RiverHorry3 — Serious14,750Fair
Sc 9 Nbl over Waccamaw RiverHorry3 — Serious14,750Fair
S-23-149 over Brushy CreekGreenville3 — Serious14,500Fair
I-20 EB over Newman SwampDarlington3 — Serious14,300Fair
I-20 WB over Newman SwampDarlington3 — Serious14,300Fair
Sc 322 over Wildcat CreekYork3 — Serious13,500Fair
S-8-88/murray DR over Turkey CreekBerkeley3 — Serious13,100Fair
US 521 NB over Waxhaw CreekLancaster3 — Serious12,850Fair
US 521 SB over Cane CreekLancaster3 — Serious12,850Fair
S-46-195 over Big Dutchman CreekYork3 — Serious12,800Fair
I-26 EB over Duncan CreekLaurens3 — Serious12,750Fair
I-26 WB over Duncan CreekLaurens3 — Serious12,750Fair
S-42-538 over Lawson Fork CreekSpartanburg3 — Serious12,400Fair
US 1 over Shaws CreekAiken3 — Serious12,200Fair
US 123 over Georges CreekPickens3 — Serious12,200Poor
US 17 Alt over Ireland CreekColleton3 — Serious11,500Fair
Sc 28 Wbl over Savannah RiverAiken3 — Serious11,300Fair
Sc 760 over Gills CreekRichland3 — Serious11,300Fair
Sc 22 EB over Waccamaw RiverHorry3 — Serious11,150Good
Sc 22 WB over Waccamaw RiverHorry3 — Serious11,150Good
S-29-54 over Six Mile CreekLancaster3 — Serious11,000Good
S-42-31 over Peters CreekSpartanburg3 — Serious11,000Poor
Sc 905 over Kingston LakeHorry3 — Serious10,900Fair
S-1100 over Hembree CreekAnderson3 — Serious10,500Good
S-23-145 over Graze CreekGreenville3 — Serious10,300Fair
Sc 557 over Crowders CreekYork3 — Serious10,200Fair
Sc 215 over Crane CreekRichland3 — Serious10,100Fair
US 501 SB over Little Pee Dee Swp-1Marion3 — Serious9,950Fair
US 501 Nbl over Little Pee Dee Swp-2Marion3 — Serious9,950Fair
US 501 Nbl over Little Pee Dee Swp-4Marion3 — Serious9,950Fair
US 501 Nbl over Little Pee Dee Swp-5Marion3 — Serious9,950Fair
US 501 Sbl over Little Pee Dee Swp-1Marion3 — Serious9,950Good
US 501 Sbl over Little Pee Dee Swp-2Marion3 — Serious9,950Fair
US 501 Sbl over Little Pee Dee Swp-4Marion3 — Serious9,950Poor
US 501 Sbl over Little Pee Dee Swp-5Marion3 — Serious9,950Fair
S-29-42 over Clems BranchLancaster3 — Serious9,900Fair
US 501 Nbl over Back SwampMarion3 — Serious9,700Fair
US 501 Sbl over Back SwampMarion3 — Serious9,700Fair
US 17 Alt over Wadboo SwampBerkeley3 — Serious9,300Fair
US 1 over Thompson CreekChesterfield3 — Serious8,800Fair
S-23-920 over Trib To Mountain CkGreenville3 — Serious8,700Good
S-23-920 over Trib To Mountain CkGreenville3 — Serious8,700Fair
S-23-920 over Mountain CreekGreenville3 — Serious8,700Fair
S-23-920 over Trib To Mountain CrkGreenville3 — Serious8,700Good
S-46-22 over Jackson BranchYork3 — Serious8,700Fair
S-29-12 over Bear CreekLancaster3 — Serious7,900Fair
S-24-268 over Rocky CreekGreenwood3 — Serious7,400Fair
Sc 290 over South Tyger RiverSpartanburg3 — Serious7,400Poor
S-4-76 over Coxs CreekAnderson3 — Serious6,900Fair
US 521 over Bear CreekClarendon3 — Serious6,900Fair
S-23-170 over Trib To Reedy RiverGreenville3 — Serious6,700Fair
S-23-170 over Trib To Reedy RiverGreenville3 — Serious6,700Fair
S-29-471 over Gills CreekLancaster3 — Serious6,700Fair
S-39-283 over Trib To Brushy CkPickens3 — Serious6,700Good
S-39-40 over Brushy CreekPickens3 — Serious6,700Fair
S-23-325 over Gilder CreekGreenville3 — Serious6,600Fair
S-29-67 over Gills CreekLancaster3 — Serious6,600Fair
US 701 over Skeebo BranchHorry3 — Serious6,450Fair
Sc 88 over Three & Twenty CreekAnderson3 — Serious6,300Fair
US 176 over Holston CreekSpartanburg3 — Serious6,300Fair
Sc 11 over Colonels Fork CreekOconee3 — Serious6,200Good
US 15 over Black CreekDarlington3 — Serious6,000Fair
S-39-134 over Brushy CreekPickens3 — Serious6,000Good
US 76 over Catfish BranchMarion3 — Serious5,900Poor
S-39-94 over Georges CreekPickens3 — Serious5,900Fair
Sc 260 over Ox SwampClarendon3 — Serious5,800Good
S-23-540 over Trib To Enoree RiverGreenville3 — Serious5,800Fair
S-23-147 over Reedy RiverGreenville3 — Serious5,600Fair
S-4-143 over Brushy CreekAnderson3 — Serious5,500Fair
S-23-440 over Gilder CreekGreenville3 — Serious5,500Good
S-10-1442 over Simmons CreekCharleston3 — Serious5,400Fair
S-30-359 over Br To Little RiverLaurens3 — Serious5,200Good
S-32-29 over Bear CreekLexington3 — Serious5,200Fair
S-37-63 over Perkins CreekOconee3 — Serious5,000Fair
S-39-30 over Trib To 18 Mile CRPickens3 — Serious5,000Poor
S-24-58 over Turner CreekGreenwood3 — Serious4,900Fair
S-46-54 over Br Of Big Allison CRYork3 — Serious4,900Fair
Sc 127 over Little RiverLaurens3 — Serious4,800Fair
S-42-123 over Grays CreekSpartanburg3 — Serious4,800Good
Sc 9 Sbl over Mitchell SwampHorry3 — Serious4,700Good
Sc 9 Nbl over Mitchell SwampHorry3 — Serious4,700Fair
Sc 9 Bus over Bear CreekLancaster3 — Serious4,700Fair
Sc 802 over Lucy Point CreekBeaufort3 — Serious4,600Fair
S-23-313 over Brushy CreekGreenville3 — Serious4,500Fair
S-4-34 over Town CreekAnderson3 — Serious4,300Fair
S-23-295 over Frohawk CreekGreenville3 — Serious4,300Fair
S-42-62 over Trib To S TygerSpartanburg3 — Serious4,300Fair
S-39-135 over Hamilton CRPickens3 — Serious4,200Poor
S-39-355 over Machine CreekPickens3 — Serious4,100Fair
Sc 133 over Trib To 6 Mi.creekPickens3 — Serious4,100Fair
S-4-48 over Broadway CreekAnderson3 — Serious4,000Fair
S-11-31 over Irene CreekCherokee3 — Serious4,000Fair
Sc 453/judge ST over Four Hole SwampDorchester3 — Serious3,900Fair
S-37-135 over Richland CreekOconee3 — Serious3,900Fair
Sc 11 over South Saluda RiverGreenville3 — Serious3,700Fair
US 176 over Kings CreekNewberry3 — Serious3,600Fair
US 176 over Duncan CreekNewberry3 — Serious3,600Fair
S-42-30 over Trib To Pacolet RiverSpartanburg3 — Serious3,600Fair
S-42-30 over Trib To Pacolet RiverSpartanburg3 — Serious3,600Fair
S-42-30 over Lawson Fork CreekSpartanburg3 — Serious3,600Good
S-4-76 over Trib. To Rocky RiverAnderson3 — Serious3,500Good
US 15 over Sammy Swamp CreekClarendon3 — Serious3,500Fair
S-23-83 over Grove CreekGreenville3 — Serious3,500Fair
Sc 261 over Sammy SwampClarendon3 — Serious3,400Fair
US 301 over Lynches RiverFlorence3 — Serious3,400Fair
S-23-958 over Rocky CreekGreenville3 — Serious3,400Fair
Sc 3 over North Edisto RiverOrangeburg3 — Serious3,400Fair
S-4-29 over Shanklin CreekAnderson3 — Serious3,300Fair
US 52 over Westfield CreekChesterfield3 — Serious3,300Fair
S-19-10 over Beaverdam CreekEdgefield3 — Serious3,300Fair
US 176 over Crims CreekNewberry3 — Serious3,300Fair
S-42-47 over Four Mile CreekSpartanburg3 — Serious3,300Good
S-44-383 over Meng CreekUnion3 — Serious3,300Fair
S-4-74 over Hornbuckle CreekAnderson3 — Serious3,200Fair
S-4-74 over Middle CreekAnderson3 — Serious3,200Fair
S-23-580 over Rocky CreekGreenville3 — Serious3,200Fair
Sc 70 over S. Edisto RiverOrangeburg3 — Serious3,200Fair
S-39-355 over Trib To Machine CkPickens3 — Serious3,200Poor
Sc 49 over Fairforest CreekUnion3 — Serious3,200Poor
S-23-106 over Grove CreekGreenville3 — Serious3,100Fair
S-23-88 over Reedy RiverGreenville3 — Serious3,100Good
US 601 over Coosawhatchie RiverHampton3 — Serious3,100Fair
Sc 135 over Trib Carpenter Ck (2)Pickens3 — Serious3,100Fair
Sc 135 over Trib Carpenter Ck (1)Pickens3 — Serious3,100Poor
US 321 over S. Edisto RiverBamberg3 — Serious3,000Fair
Sc 61/augusta HWY over Edisto River SwampColleton3 — Serious3,000Fair
Sc 61/augusta HWY over Edisto River SwampColleton3 — Serious3,000Fair
S-39-32 over Town CreekPickens3 — Serious3,000Fair
S-39-325 over Mad Dog CreekPickens3 — Serious3,000Fair
Sc 64/bells HWY over Buckhead CreekColleton3 — Serious2,900Fair
S-42-88 over Beaverdam CreekSpartanburg3 — Serious2,900Good
S-42-88 over Fairforest CreekSpartanburg3 — Serious2,900Poor
S-4-485 over Middle Branch Bushy CkAnderson3 — Serious2,800Fair
S-24-285 over Rocky CreekGreenwood3 — Serious2,800Poor
Sc 63 over Whippy SwampHampton3 — Serious2,800Good
Sc 63 over Salkehatchie River SwampHampton3 — Serious2,800Fair
S-36-684 over Scotts CreekNewberry3 — Serious2,800Fair
S-39-160 over Trib To Keowee RiverPickens3 — Serious2,800Poor
S-39-270 over Fifteen Mile CreekPickens3 — Serious2,800Poor
S-39-274 over Trib To Rices CreekPickens3 — Serious2,800Fair
S-42-77 over Middle Tyger RiverSpartanburg3 — Serious2,800Poor
S-2-79 over Cedar Creek #1Aiken3 — Serious2,700Fair
S-4-76 over Big Beaverdam CreekAnderson3 — Serious2,700Fair