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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
RED ROCK CREEK Iowa Scour Critical — Countermeasures Installed Poor 1926 30
OVER FLOW Iowa Scour Critical — Countermeasures Installed Poor 1900 30
BIG WHISKEY CREEK Iowa Scour Critical — Countermeasures Installed Poor 1953 30
NISHNABOTNA RIVER Iowa Scour Critical — Countermeasures Installed Fair 1980 29
BR PRAIRIE CK Iowa Scour Critical — Countermeasures Installed Poor 1900 29
CROOKED CREEK Iowa Scour Critical — Countermeasures Installed Poor 1950 29
GIZZARD CREEK Iowa Scour Critical — Countermeasures Installed Fair 2000 29
DOWD CREEK Iowa Scour Critical — Countermeasures Installed Fair 1956 29
STREAM Iowa Scour Critical — Countermeasures Installed Poor 1959 29
SMALL CREEK Iowa Scour Critical — Countermeasures Installed Poor 1916 29
CREEK Iowa Scour Critical — Countermeasures Installed Fair 1900 29
MIDDLE RIVER Iowa Scour Critical — Countermeasures Installed Fair 1930 29
SMALL Iowa Scour Critical — Countermeasures Installed Fair 1900 26
STEIN CK Iowa Scour Critical — Countermeasures Installed Fair 1989 26
MAYNES CREEK Iowa Scour Critical — Countermeasures Installed Poor 1900 26
FLOOD CREEK Iowa Scour Critical — Countermeasures Installed Poor 1910 26
MAPLE RIVER Iowa Scour Critical — Countermeasures Installed Poor 1900 26
ELK CREEK Iowa Scour Critical — Countermeasures Installed Poor 1983 26
LITTLE SIOUX RIVER Iowa Scour Critical — Countermeasures Installed Fair 1964 26
FLOOD CREEK Iowa Scour Critical — Countermeasures Installed Poor 1929 26
BEAVERDAM CREEK Iowa Scour Critical — Countermeasures Installed Fair 1980 26
BLACKHAWK CREEK Iowa Scour Critical — Countermeasures Installed Fair 1957 26
MINK CREEK Iowa Scour Critical — Countermeasures Installed Poor 1938 26
BRANCH SUGAR CREEK Iowa Scour Critical — Countermeasures Installed Poor 1922 26
W NODAWAY RIVER Iowa Scour Critical — Countermeasures Installed Poor 1970 26
ROCK CREEK Iowa Scour Critical — Countermeasures Installed Poor 1954 26
SMALL Iowa Scour Critical — Countermeasures Installed Poor 1983 26
OVERFLOW Iowa Scour Critical — Countermeasures Installed Poor 1900 26
OVERFLOW Iowa Scour Critical — Countermeasures Installed Fair 1900 26
WILLOW CREEK Iowa Scour Critical — Countermeasures Installed Poor 1900 26
HUNTERS BRANCH Iowa Scour Critical — Countermeasures Installed Poor 1965 26
INDIAN CREEK Iowa Scour Critical — Countermeasures Installed Poor 1940 26
EAST INDIAN CREEK Iowa Scour Critical — Countermeasures Installed Fair 1915 26
CEDAR CREEK Iowa Scour Critical — Countermeasures Installed Fair 1962 25
N BEAVER CREEK Iowa Scour Critical — Countermeasures Installed Fair 1958 25
NORTH SKUNK RIVER Iowa Scour Critical — Countermeasures Installed Poor 1918 25
CREEK Iowa Scour Critical — Countermeasures Installed Poor 1918 25
MIDDLE NODAWAY RIVER Iowa Scour Critical — Countermeasures Installed Poor 1900 21
STREAM Iowa Scour Critical — Countermeasures Installed Poor 1944 21
STREAM Iowa Scour Critical — Countermeasures Installed Poor 1900 21
WHITE FOX CREEK Iowa Scour Critical — Countermeasures Installed Poor 1975 21
SIMPSON CREEK Iowa Scour Critical — Countermeasures Installed Fair 1981 21
HOCKETT CREEK Iowa Scour Critical — Countermeasures Installed Fair 1900 21
SMALL STREAM Iowa Scour Critical — Countermeasures Installed Poor 1965 21
OTTER CREEK Iowa Scour Critical — Countermeasures Installed Fair 1991 21
SOLDIER RIVER Iowa Scour Critical — Countermeasures Installed Fair 1951 21
STREAM Iowa Scour Critical — Countermeasures Installed Fair 1900 21
LITTLE ROCK RIVER Iowa Scour Critical — Countermeasures Installed Fair 1989 21
LITTLE OCHEYDAN RIVER Iowa Scour Critical — Countermeasures Installed Fair 1941 21
WRIGHT CREEK Iowa Scour Critical — Countermeasures Installed Poor 1900 20

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