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Scour Critical Bridges in Iowa

392 bridges in Iowa 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 392 bridges in Iowa have been identified as vulnerable to scour damage.

Clear
Bridge State Scour Status Condition Year Built ADT
EAGLE CREEK Iowa Scour Critical — Countermeasures Installed Fair 1986 112
LOCAL CREEK Iowa Scour Critical — Countermeasures Installed Poor 1958 110
NORTH SKUNK RIVER Iowa Scour Critical — Countermeasures Installed Poor 1936 106
SMALL STREAM Iowa Scour Critical — Countermeasures Installed Poor 1986 104
SMALL STREAM Iowa Scour Critical — Countermeasures Installed Poor 1921 104
BUCK CREEK Iowa Scour Critical — Countermeasures Installed Poor 1919 104
WATERWAY Iowa Scour Critical — Countermeasures Installed Poor 1930 100
BALLARD CREEK Iowa Scour Critical — Countermeasures Installed Fair 1919 100
BUCK CREEK Iowa Scour Critical — Countermeasures Installed Poor 1928 91
SKUNK RIVER TRIBUTARY Iowa Scour Critical — Countermeasures Installed Fair 1927 91
CREEK Iowa Scour Critical — Countermeasures Installed Poor 1934 90
STREAM Iowa Scour Critical — Countermeasures Installed Poor 1978 89
TARKIO CREEK Iowa Scour Critical — Countermeasures Installed Fair 1971 89
SUGAR CREEK Iowa Scour Critical — Countermeasures Installed Fair 1946 80
DEVIL CREEK Iowa Scour Critical — Countermeasures Installed Fair 1955 80
CLEAR CREEK Iowa Scour Critical — Countermeasures Installed Fair 1939 80
DRAINAGE Iowa Scour Critical — Countermeasures Installed Fair 1900 79
WEST FORK CEDAR RIVER Iowa Scour Critical — Countermeasures Installed Poor 1920 79
CREEK Iowa Scour Critical — Countermeasures Installed Poor 1928 78
BRANCH BEAVER CREEK Iowa Scour Critical — Countermeasures Installed Fair 1956 78
TURKEY CREEK Iowa Scour Critical — Countermeasures Installed Fair 1937 71
STREAM Iowa Scour Critical — Countermeasures Installed Fair 1979 71
CAMP CREEK Iowa Scour Critical — Countermeasures Installed Fair 1954 71
CREEK Iowa Scour Critical — Countermeasures Installed Poor 1900 70
SMALL STREAM Iowa Scour Critical — Countermeasures Installed Fair 1974 70
CREEK Iowa Scour Critical — Countermeasures Installed Poor 1900 70
COLD WATER CREEK Iowa Scour Critical — Countermeasures Installed Fair 1962 70
STREAM Iowa Scour Critical — Countermeasures Installed Poor 1958 62
ELKHORN CREEK Iowa Scour Critical — Countermeasures Installed Poor 1973 62
SMALL STREAM Iowa Scour Critical — Countermeasures Installed Poor 1900 62
REEDS CR Iowa Scour Critical — Countermeasures Installed Poor 1959 62
OTTER CR Iowa Scour Critical — Countermeasures Installed Fair 1966 62
PINNEY CREEK Iowa Scour Critical — Countermeasures Installed Poor 1900 62
MINOR DRAINAGE Iowa Scour Critical — Countermeasures Installed Poor 1930 61
AVERY CREEK Iowa Scour Critical — Countermeasures Installed Fair 1968 60
DRAINAGE Iowa Scour Critical — Countermeasures Installed Fair 1978 60
SMALL STREAM Iowa Scour Critical — Countermeasures Installed Poor 1930 60
WHISKEY CREEK Iowa Scour Critical — Countermeasures Installed Poor 1917 60
BIG BEAR CREEK Iowa Scour Critical — Countermeasures Installed Poor 1955 60
MUD CK Iowa Scour Critical — Countermeasures Installed Poor 1965 60
STREAM Iowa Scour Critical — Countermeasures Installed Poor 1980 60
BRUSHY FORK CREEK Iowa Scour Critical — Countermeasures Installed Poor 1925 60
MUDDY CREEK Iowa Scour Critical — Countermeasures Installed Poor 1970 60
OTTER CREEK Iowa Scour Critical — Countermeasures Installed Fair 1936 60
BAILEYE CREEK Iowa Scour Critical — Countermeasures Installed Fair 1967 59
CREEK Iowa Scour Critical — Countermeasures Installed Poor 1978 59
POYNER CREEK Iowa Scour Critical — Countermeasures Installed Poor 1960 59
QUARTER SECTION RUN Iowa Scour Critical — Countermeasures Installed Fair 1993 59
HARTGRAVE CK Iowa Scour Critical — Countermeasures Installed Poor 1952 59
MILLER CREEK Iowa Scour Critical — Countermeasures Installed Poor 1981 58

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