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Scour Critical Bridges in Minnesota

257 bridges in Minnesota 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 257 bridges in Minnesota have been identified as vulnerable to scour damage.

Clear
Bridge State Scour Status Condition Year Built ADT
STREAM Minnesota Scour Critical — Countermeasures Installed Fair 1974 15
CO DITCH # 22 Minnesota Scour Critical — Countermeasures Installed Fair 1963 13
CANFIELD CREEK Minnesota Scour Critical — Countermeasures Installed Fair 1935 12
W BRANCH KETTLE RIVER Minnesota Scour Critical — Countermeasures Installed Fair 2016 5
THIRD RIVER Minnesota Scour Critical — Countermeasures Installed Good 1983 5
SPRAGUE CREEK Minnesota Scour Critical — Countermeasures Installed Poor 1970 2
TROUT BROOK (TRIBUTARY) Minnesota Scour Critical — Countermeasures Installed Fair 1980 1

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