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Scour Critical Bridges in Idaho

215 bridges in Idaho 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 215 bridges in Idaho have been identified as vulnerable to scour damage.

Clear
Bridge State Scour Status Condition Year Built ADT
BLACKFOOT R. & TRAIL CR. Idaho Scour Critical — Countermeasures Installed Fair 1985 30
SALMON FALLS CREEK Idaho Scour Critical — Countermeasures Installed Fair 1921 30
WILDHORSE RIVER Idaho Scour Critical — Countermeasures Installed Poor 1908 30
DODGE CREEK Idaho Scour Critical — Countermeasures Installed Fair 1983 30
SALMON RIVER Idaho Scour Critical — Countermeasures Installed Fair 1989 30
DEADWOOD RIVER Idaho Scour Critical — Countermeasures Installed Fair 1959 30
TAMARACK CREEK Idaho Scour Critical — Countermeasures Installed Fair 1975 30
WILDHORSE CREEK Idaho Scour Critical — Countermeasures Installed Fair 1970 25
Y-1 Canal Idaho Scour Critical — Countermeasures Installed Good 1991 25
Shoshone Creek Idaho Scour Critical — Countermeasures Installed Good 1985 25
INDIAN CREEK(#2) Idaho Scour Critical — Countermeasures Installed Fair 1970 15
INDIAN CREEK(#3) Idaho Scour Critical — Countermeasures Installed Fair 1970 15
INDIAN CREEK(#4) Idaho Scour Critical — Countermeasures Installed Fair 1970 15
PARTRIDGE CREEK Idaho Scour Critical — Countermeasures Installed Fair 1990 4
PARTRIDGE CREEK Idaho Scour Critical — Countermeasures Installed Fair 1990 4

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