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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
NINE MILE CREEK Iowa Scour Critical — Countermeasures Installed Fair 1971 51
SOUTH FORK IOWA RIVER Iowa Scour Critical — Countermeasures Installed Poor 1982 51
STREAM Iowa Scour Critical — Countermeasures Installed Poor 1953 50
BRANCH OLD MANS CREEK Iowa Scour Critical — Countermeasures Installed Poor 1930 50
PRAIRIE CREEK Iowa Scour Critical — Countermeasures Installed Poor 1947 50
IOWAY CREEK Iowa Scour Critical — Countermeasures Installed Poor 1949 50
RAT CREEK Iowa Scour Critical — Countermeasures Installed Fair 1900 50
INDIAN CREEK Iowa Scour Critical — Countermeasures Installed Poor 1964 50
FIELD STREAM Iowa Scour Critical — Countermeasures Installed Fair 1972 50
CREEK Iowa Scour Critical — Countermeasures Installed Poor 1978 50
RAT CREEK Iowa Scour Critical — Countermeasures Installed Fair 2008 50
S AVERY CREEK Iowa Scour Critical — Countermeasures Installed Fair 1975 50
ROCK RUN CREEK Iowa Scour Critical — Countermeasures Installed Poor 1974 50
BR MILL CR Iowa Scour Critical — Countermeasures Installed Poor 1925 50
CREEK Iowa Scour Critical — Countermeasures Installed Poor 1956 50
SOUTH FORK LONG CREEK Iowa Scour Critical — Countermeasures Installed Fair 1966 50
SMALL STREAM Iowa Scour Critical — Countermeasures Installed Poor 1917 50
DRAINAGE Iowa Scour Critical — Countermeasures Installed Poor 1964 50
N BR NORTH RIVER Iowa Scour Critical — Countermeasures Installed Poor 1915 50
MAYNES CREEK Iowa Scour Critical — Countermeasures Installed Poor 1952 49
CREEK Iowa Scour Critical — Countermeasures Installed Poor 1975 47
HEFFERMAN CREEK Iowa Scour Critical — Countermeasures Installed Poor 1900 46
KNACK CREEK Iowa Scour Critical — Countermeasures Installed Poor 1915 46
CEDAR CREEK Iowa Scour Critical — Countermeasures Installed Poor 1952 46
W FK W NISHNABOTNA RIVER Iowa Scour Critical — Countermeasures Installed Poor 1944 46
DEER CREEK Iowa Scour Critical — Countermeasures Installed Poor 1977 45
EAST NODAWAY RIVER Iowa Scour Critical — Countermeasures Installed Fair 1957 45
MOORE CREEK Iowa Scour Critical — Countermeasures Installed Fair 1964 45
RAINES BRANCH Iowa Scour Critical — Countermeasures Installed Fair 1954 45
STREAM Iowa Scour Critical — Countermeasures Installed Poor 1961 45
PRAIRIE CREEK Iowa Scour Critical — Countermeasures Installed Fair 1990 45
BEAVER CREEK Iowa Scour Critical — Countermeasures Installed Fair 1955 45
SUGAR CREEK Iowa Scour Critical — Countermeasures Installed Poor 1933 45
SMALL STREAM Iowa Scour Critical — Countermeasures Installed Fair 1986 45
MILLER CREEK Iowa Scour Critical — Countermeasures Installed Fair 1978 45
TRIB TO CEDAR RIVER Iowa Scour Critical — Countermeasures Installed Fair 1983 44
CREEK Iowa Scour Critical — Countermeasures Installed Fair 1971 44
BRANCH WOLF CREEK Iowa Scour Critical — Countermeasures Installed Poor 1915 44
IOWA RIVER Iowa Scour Critical — Countermeasures Installed Poor 1975 42
MIDDLE RIVER Iowa Scour Critical — Countermeasures Installed Poor 1958 41
KLONDIKE CREEK Iowa Scour Critical — Countermeasures Installed Poor 1900 41
BARRY CREEK Iowa Scour Critical — Countermeasures Installed Fair 1900 41
JIM BRANCH Iowa Scour Critical — Countermeasures Installed Poor 1978 41
WATERWAY Iowa Scour Critical — Countermeasures Installed Poor 1967 41
BUCK CREEK Iowa Scour Critical — Countermeasures Installed Fair 1961 41
BRANCH NORTH TIMBER CRK Iowa Scour Critical — Countermeasures Installed Poor 1924 41
KEG CREEK Iowa Scour Critical — Countermeasures Installed Poor 1964 41
BRUSH CREEK Iowa Scour Critical — Countermeasures Installed Poor 1900 41
TROUBLESOME CREEK Iowa Scour Critical — Countermeasures Installed Poor 1948 40
STREAM Iowa Scour Critical — Countermeasures Installed Poor 1948 40

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