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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
DRAINAGE Iowa Scour Critical — Countermeasures Installed Fair 1948 40
CREEK Iowa Scour Critical — Countermeasures Installed Poor 1924 40
STREAM Iowa Scour Critical — Countermeasures Installed Poor 1948 40
BRANCH OTTER CREEK Iowa Scour Critical — Countermeasures Installed Poor 1951 40
MIDDLE WILLOW CREEK Iowa Scour Critical — Countermeasures Installed Fair 1954 40
STREAM Iowa Scour Critical — Countermeasures Installed Poor 1969 40
SOLDIER RIVER Iowa Scour Critical — Countermeasures Installed Poor 1957 40
TROUBLESOME CREEK Iowa Scour Critical — Countermeasures Installed Poor 1948 40
WOLF CREEK Iowa Scour Critical — Countermeasures Installed Poor 1956 40
SMALL Iowa Scour Critical — Countermeasures Installed Fair 1930 40
WILD CAT CREEK Iowa Scour Critical — Countermeasures Installed Poor 1900 39
NORTH BEAR CREEK Iowa Scour Critical — Countermeasures Installed Poor 1957 39
CREEK Iowa Scour Critical — Countermeasures Installed Poor 1950 39
UPPER IOWA RIVER Iowa Scour Critical — Countermeasures Installed Poor 1913 39
MIDDLE FORK BEAVER CREEK Iowa Scour Critical — Countermeasures Installed Poor 1948 39
SMALL STREAM Iowa Scour Critical — Countermeasures Installed Fair 1952 36
MAYNES CREEK Iowa Scour Critical — Countermeasures Installed Fair 1993 35
W BR WAPSINONOC CREEK Iowa Scour Critical — Countermeasures Installed Poor 1979 35
BEAVER CREEK Iowa Scour Critical — Countermeasures Installed Poor 1954 35
SMALL STREAM Iowa Scour Critical — Countermeasures Installed Poor 1968 35
EMERY CREEK Iowa Scour Critical — Countermeasures Installed Poor 1900 35
SMALL STREAM Iowa Scour Critical — Countermeasures Installed Poor 1974 35
INDIAN CREEK Iowa Scour Critical — Countermeasures Installed Poor 1918 35
MUD CREEK Iowa Scour Critical — Countermeasures Installed Poor 1945 34
BR STEIN CK Iowa Scour Critical — Countermeasures Installed Poor 1969 34
PIONEER CREEK Iowa Scour Critical — Countermeasures Installed Poor 1976 34
MCELHANEY CREEK Iowa Scour Critical — Countermeasures Installed Fair 1982 34
STREAM Iowa Scour Critical — Countermeasures Installed Poor 1975 34
EAST SOLDIER RIVER Iowa Scour Critical — Countermeasures Installed Poor 1957 34
SMALL STREAM Iowa Scour Critical — Countermeasures Installed Fair 1969 34
S. RACCOON RIVER Iowa Scour Critical — Countermeasures Installed Fair 1959 34
DRAINAGE Iowa Scour Critical — Countermeasures Installed Poor 1900 34
WEST RAT CREEK Iowa Scour Critical — Countermeasures Installed Fair 1900 34
LITTLE SIOUX Iowa Scour Critical — Countermeasures Installed Poor 1920 31
SILVER CREEK Iowa Scour Critical — Countermeasures Installed Fair 1981 30
MIDDLE NODAWAY RIVER Iowa Scour Critical — Countermeasures Installed Poor 1920 30
WALNUT CREEK Iowa Scour Critical — Countermeasures Installed Poor 1925 30
SMALL STREAM Iowa Scour Critical — Countermeasures Installed Fair 1990 30
WATERWAY Iowa Scour Critical — Countermeasures Installed Poor 1958 30
ROCK CREEK Iowa Scour Critical — Countermeasures Installed Poor 1915 30
W BR MILL CREEK Iowa Scour Critical — Countermeasures Installed Fair 1947 30
WINNEBAGO RIVER Iowa Scour Critical — Countermeasures Installed Good 1975 30
LITTLE WAPSIPINICON RVR Iowa Scour Critical — Countermeasures Installed Poor 1952 30
PRAIRIE CK Iowa Scour Critical — Countermeasures Installed Fair 1977 30
W FK W NISHNABOTNA RIVER Iowa Scour Critical — Countermeasures Installed Poor 1945 30
BIG WHISKEY CREEK Iowa Scour Critical — Countermeasures Installed Poor 1953 30
BOYER RIVER Iowa Scour Critical — Countermeasures Installed Poor 1971 30
BIG CREEK Iowa Scour Critical — Countermeasures Installed Poor 1949 30
EAST SOLDIER RIVER Iowa Scour Critical — Countermeasures Installed Fair 1945 30
RED ROCK CREEK Iowa Scour Critical — Countermeasures Installed Poor 1926 30

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