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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
WHITE FOX CREEK Iowa Scour Critical — Countermeasures Installed Fair 1983 15
E FK GRAND RIVER Iowa Scour Critical — Countermeasures Installed Poor 1970 15
E FK GRAND RIVER Iowa Scour Critical — Countermeasures Installed Poor 1958 15
CREEK Iowa Scour Critical — Countermeasures Installed Poor 1972 15
STREAM Iowa Scour Critical — Countermeasures Installed Poor 1950 15
STREAM Iowa Scour Critical — Countermeasures Installed Poor 1938 15
STREAM Iowa Scour Critical — Countermeasures Installed Poor 1979 15
STREAM Iowa Scour Critical — Countermeasures Installed Poor 1950 15
STREAM Iowa Scour Critical — Countermeasures Installed Poor 1979 15
RUTT BRANCH Iowa Scour Critical — Countermeasures Installed Fair 1961 11
STREAM Iowa Scour Critical — Countermeasures Installed Fair 1955 11
STREAM Iowa Scour Critical — Countermeasures Installed Poor 1958 11
OPOSSUM CK Iowa Scour Critical — Countermeasures Installed Poor 1959 11
SMALL STREAM Iowa Scour Critical — Countermeasures Installed Poor 1970 11
LONE TREE BRANCH Iowa Scour Critical — Countermeasures Installed Poor 1987 11
SMALL STREAM Iowa Scour Critical — Countermeasures Installed Poor 1987 11
STREAM Iowa Scour Critical — Countermeasures Installed Poor 1978 11
BR OF CARRUTHERS CREEK Iowa Scour Critical — Countermeasures Installed Poor 1900 11
SIOUX RIVER Iowa Scour Critical — Countermeasures Installed Poor 1931 11
SMALL STREAM Iowa Scour Critical — Countermeasures Installed Poor 1982 11
WALNUT CREEK Iowa Scour Critical — Countermeasures Installed Fair 1956 11
DD #219 Iowa Scour Critical — Countermeasures Installed Poor 1972 11
TRIB TO MIDDLE RIVER Iowa Scour Critical — Countermeasures Installed Fair 1984 11
IA RIVER Iowa Scour Critical — Countermeasures Installed Poor 1965 11
SOLDIER RIVER Iowa Scour Critical — Countermeasures Installed Poor 1900 11
SMALL CREEK Iowa Scour Critical — Countermeasures Installed Poor 1940 11
RED ROCK CREEK Iowa Scour Critical — Countermeasures Installed Poor 1947 11
SUGAR CREEK Iowa Scour Critical — Countermeasures Installed Poor 1978 11
NORTH FORK CLANTON CREEK Iowa Scour Critical — Countermeasures Installed Fair 1983 11
DRAINAGE Iowa Scour Critical — Countermeasures Installed Poor 1956 11
HAWK RUN Iowa Scour Critical — Countermeasures Installed Poor 1925 11
SPRING VALLEY CR Iowa Scour Critical — Countermeasures Installed Poor 1940 11
CREEK Iowa Scour Critical — Countermeasures Installed Poor 1990 11
CREEK Iowa Scour Critical — Countermeasures Installed Fair 1963 11
ENGLISH CREEK Iowa Scour Critical — Countermeasures Installed Fair 1968 11
WEST NODAWAY TRIB Iowa Scour Critical — Countermeasures Installed Fair 1961 11
LONG BRANCH Iowa Scour Critical — Countermeasures Installed Poor 1955 11
WALNUT CREEK Iowa Scour Critical — Countermeasures Installed Poor 1977 11
SKUNK RIVER Iowa Scour Critical — Countermeasures Installed Poor 1876 11
MIDDLE 102 RIVER Iowa Scour Critical — Countermeasures Installed Poor 1949 11
CREEK Iowa Scour Critical — Countermeasures Installed Poor 1959 11
UNNAMED CREEK Iowa Scour Critical — Countermeasures Installed Poor 1935 11
SOUTH RIVER Iowa Scour Critical — Countermeasures Installed Fair 1950 11
PAINTER CREEK Iowa Scour Critical — Countermeasures Installed Poor 1945 11
SMALL STREAM Iowa Scour Critical — Countermeasures Installed Poor 1917 11
SMALL STREAM Iowa Scour Critical — Countermeasures Installed Fair 2001 11
SMALL STREAM Iowa Scour Critical — Countermeasures Installed Poor 1985 11
WOLF CREEK Iowa Scour Critical — Countermeasures Installed Poor 1938 11
WRIGHT CREEK Iowa Scour Critical — Countermeasures Installed Poor 1950 11
BRUSH CREEK Iowa Scour Critical — Countermeasures Installed Poor 1946 10

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