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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
DOG CREEK Iowa Scour Critical — Countermeasures Installed Good 2009 10
BRUSH CREEK Iowa Scour Critical — Countermeasures Installed Poor 1946 10
BRUSH CREEK Iowa Scour Critical — Countermeasures Installed Good 2016 10
MIDDLE RIVER Iowa Scour Critical — Countermeasures Installed Fair 1915 5
EAST NODAWAY RIVER Iowa Scour Critical — Countermeasures Installed Poor 1900 5
STREAM Iowa Scour Critical — Countermeasures Installed Good 2020 5
WATERWAY Iowa Scour Critical — Countermeasures Installed Poor 1995 5
SPRING BRANCH CREEK Iowa Scour Critical — Countermeasures Installed Poor 1980 5
EAST LONG CREEK Iowa Scour Critical — Countermeasures Installed Poor 1977 5
PARADISE CREEK Iowa Scour Critical — Countermeasures Installed Good 1988 5
WILLOW CREEK Iowa Scour Critical — Countermeasures Installed Fair 1950 5
CREEK Iowa Scour Critical — Countermeasures Installed Fair 1941 5
MINOR DRAINAGE Iowa Scour Critical — Countermeasures Installed Poor 1971 5
CREEK Iowa Scour Critical — Countermeasures Installed Poor 1964 5
WALNUT CREEK Iowa Scour Critical — Countermeasures Installed Poor 1945 5
STONY FORK Iowa Scour Critical — Countermeasures Installed Poor 1951 5
BURNETT CR Iowa Scour Critical — Countermeasures Installed Poor 1917 5
DEER CREEK Iowa Scour Critical — Countermeasures Installed Poor 1977 5
STREAM Iowa Scour Critical — Countermeasures Installed Poor 1954 5
FARM CREEK Iowa Scour Critical — Countermeasures Installed Poor 1963 5
TRIB TARKIO Iowa Scour Critical — Countermeasures Installed Poor 1955 5
SMALL STREAM Iowa Scour Critical — Countermeasures Installed Poor 1985 5
CLEAR CREEK Iowa Scour Critical — Countermeasures Installed Poor 1946 5
N LIZARD CREEK Iowa Scour Critical — Countermeasures Installed Poor 1916 5
GRAYBILL CREEK Iowa Scour Critical — Countermeasures Installed Poor 1947 5
LOTTS CREEK Iowa Scour Critical — Countermeasures Installed Poor 1952 5
GOOSEBERRY CREEK Iowa Scour Critical — Countermeasures Installed Poor 1956 5
STREAM Iowa Scour Critical — Countermeasures Installed Poor 1956 5
E FK GRAND RIVER Iowa Scour Critical — Countermeasures Installed Fair 1936 5
PLATTE BRANCH Iowa Scour Critical — Countermeasures Installed Fair 1945 5
STREAM Iowa Scour Critical — Countermeasures Installed Poor 1973 5
TRIB TO SPRING CREEK Iowa Scour Critical — Countermeasures Installed Poor 1950 5
CREEK Iowa Scour Critical — Countermeasures Installed Poor 1900 5
STREAM Iowa Scour Critical — Countermeasures Installed Poor 1950 5
STREAM Iowa Scour Critical — Countermeasures Installed Poor 1970 5
EAGLE CREEK Iowa Scour Critical — Countermeasures Installed Poor 1975 5
PLEASANT CREEK Iowa Scour Critical — Countermeasures Installed Fair 1972 1
PRAIRIE CREEK Iowa Scour Critical — Countermeasures Installed Poor 1952 1
HONEY CREEK Iowa Scour Critical — Countermeasures Installed Fair 1929 —
SILVER LAKE CAUSEWAY Iowa Scour Critical — Countermeasures Installed Good 1984 —
FROG HOLLOW CREEK Iowa Scour Critical — Countermeasures Installed Fair 1957 —
BUFFALO CREEK Iowa Scour Critical — Countermeasures Installed Fair 1900 —

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