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Scour Critical Bridges in Delaware

39 bridges in Delaware at risk from water erosion around foundations.

Scour Critical Bridges

Scour is the erosion of soil and rock around a bridge's foundation caused by moving water. When foundations are exposed or undermined, a bridge can collapse even if its deck and superstructure are in good condition. Scour is the leading cause of bridge failures in the US. These 39 bridges in Delaware have been identified as vulnerable to scour damage.

Clear
Bridge State Scour Status Condition Year Built ADT
WHITE CLAY CREEK Delaware Scour Critical — Countermeasures Installed Fair 1955 23,150
TRIB TO LITTLE MILL CRK Delaware Scour Critical — Countermeasures Installed Good 1949 21,909
RED CLAY CREEK & RR Delaware Scour Critical — Countermeasures Installed Fair 1940 20,030
RED CLAY CREEK & RR Delaware Scour Critical — Countermeasures Installed Fair 1940 20,030
RED CLAY CREEK Delaware Scour Critical — Countermeasures Installed Fair 1967 16,101
LITTLE DUCK CREEK Delaware Scour Critical — Countermeasures Installed Fair 1934 13,624
LEIPSIC RIVER Delaware Scour Critical — Countermeasures Installed Fair 1929 13,623
HYDE RUN Delaware Scour Critical — Countermeasures Installed Fair 1936 13,392
WATERWAY Delaware Scour Critical — Countermeasures Installed Fair 1925 12,820
ST. JONES RIVER Delaware Scour Critical — Countermeasures Installed Fair 1885 11,547
ISAAC BRANCH-MOORES LAKE Delaware Scour Critical — Countermeasures Installed Fair 1919 11,225
NANTICOKE RIVER Delaware Scour Critical — Countermeasures Installed Fair 1920 11,140
BLACKBIRD CREEK Delaware Scour Critical — Countermeasures Installed Fair 1933 11,021
BLACKBIRD CREEK Delaware Scour Critical — Countermeasures Installed Poor 1920 11,020
RED CLAY CREEK Delaware Scour Critical — Countermeasures Installed Fair 1931 10,072
TIDBURY BRANCH Delaware Scour Critical — Countermeasures Installed Fair 1919 9,355
ST. JONES RIVER Delaware Scour Critical — Countermeasures Installed Fair 1934 7,666
BROWNS BRANCH Delaware Scour Critical — Countermeasures Installed Good 1922 7,277
MORRIS MILL POND Delaware Scour Critical — Countermeasures Installed Fair 1932 6,149
JAMES BRANCH Delaware Scour Critical — Countermeasures Installed Fair 1920 6,064
CLEAR BROOK Delaware Scour Critical — Countermeasures Installed Fair 1919 3,966
DIRICKSON CREEK Delaware Scour Critical — Countermeasures Installed Fair 1961 3,548
JOHNSON BRANCH Delaware Scour Critical — Countermeasures Installed Fair 1947 3,486
MILL RACE Delaware Scour Critical — Countermeasures Installed Fair 1982 3,366
BARLOW BRANCH Delaware Scour Critical — Countermeasures Installed Fair 1935 2,266
MATSON RUN Delaware Scour Critical — Countermeasures Installed Fair 1980 1,932
POCOMOKE RIVER Delaware Scour Critical — Countermeasures Installed Fair 1968 1,366
CLENDANIEL POND Delaware Scour Critical — Countermeasures Installed Fair 1932 1,276
BALD CYPRESS BRANCH Delaware Scour Critical — Countermeasures Installed Fair 1962 1,136
CHRISTINA CREEK Delaware Scour Critical — Countermeasures Installed Good 1969 987
PAW PAW BRANCH Delaware Scour Critical — Countermeasures Installed Fair 1933 951
PROVIDENCE CREEK Delaware Scour Critical — Countermeasures Installed Good 1965 943
BLACK SWAMP CREEK Delaware Scour Critical — Countermeasures Installed Fair 1949 667
CULBRETH MARSH DITCH Delaware Scour Critical — Countermeasures Installed Good 1957 660
WHITE MARSH BRANCH Delaware Scour Critical — Countermeasures Installed Fair 1957 192
TRIB. TO WHITE CLAY CREE Delaware Scour Critical — Countermeasures Installed Fair 1976 99
WILSON RUN Delaware Scour Critical — Countermeasures Installed Good 1980 99
SLAUGHTER CREEK Delaware Scour Critical — Countermeasures Installed Poor 1931 78
PIKE CREEK Delaware Scour Critical — Countermeasures Installed Good 1970 21

Scour Critical Rating Codes

Code 2 — UnaddressedBridge is scour critical with no countermeasures installed. The foundation is vulnerable and no protective action has been taken.
Code 3 — Countermeasures InstalledProtective measures (riprap, sheet piling, etc.) have been installed to reduce scour risk, but the bridge remains classified as scour critical.
Code 6 — Countermeasures IneffectiveProtective measures were installed but have been assessed as ineffective. The bridge requires re-evaluation and additional action.

About Scour Critical Bridges

Scour critical bridges have been identified through underwater inspection or analysis as having foundations that are unstable or could become unstable during flood conditions. FHWA requires action plans for all scour critical bridges. Famous scour failures include the 1987 Schoharie Creek Bridge collapse in New York.

All Bridges Poor Condition Historic Bridges Bridge Stats