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Scour Critical Bridges in Arizona

164 bridges in Arizona 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 164 bridges in Arizona have been identified as vulnerable to scour damage.

Clear
Bridge State Scour Status Condition Year Built ADT
BLACK CANYON WASH Arizona Scour Critical — Unaddressed Poor 1986 2,051
LAGUNA CREEK Arizona Scour Critical — Unaddressed Poor 1965 150
HUACHUCA CANYON CREEK Arizona Scour Critical — Countermeasures Ineffective Good 2021 300
CORDUROY CREEK Arizona Scour Critical — Countermeasures Ineffective Fair 1973 40
Indian Bend Wash Arizona Scour Critical — Countermeasures Installed Fair 1979 57,843
Grand Canal Arizona Scour Critical — Countermeasures Installed Fair 1979 52,404
Cave Creek Arizona Scour Critical — Countermeasures Installed Fair 1965 40,125
Indian Bend Wash Arizona Scour Critical — Countermeasures Installed Poor 1976 37,601
Cave Creek Arizona Scour Critical — Countermeasures Installed Fair 1976 36,376
Colorado River Arizona Scour Critical — Countermeasures Installed Fair 1987 31,500
Indian Bend Wash Arizona Scour Critical — Countermeasures Installed Fair 1978 31,074
Rillito Creek Arizona Scour Critical — Countermeasures Installed Fair 1970 31,053
Grand Canal Arizona Scour Critical — Countermeasures Installed Fair 1957 23,182
Rillito River Arizona Scour Critical — Countermeasures Installed Fair 1971 22,976
Cave Creek Arizona Scour Critical — Countermeasures Installed Fair 1958 20,381
Ventana Wash Arizona Scour Critical — Countermeasures Installed Fair 1967 17,470
Arizona Canal Arizona Scour Critical — Countermeasures Installed Fair 1946 13,080
Santa Cruz River Arizona Scour Critical — Countermeasures Installed Fair 1953 11,577
Pima Lateral Canal Arizona Scour Critical — Countermeasures Installed Fair 1920 11,494
Lee Moore Wash Arizona Scour Critical — Countermeasures Installed Fair 1973 11,193
McClellan Wash Arizona Scour Critical — Countermeasures Installed Fair 1960 10,511
Santa Cruz Wash Arizona Scour Critical — Countermeasures Installed Fair 1960 10,511
Santa Cruz River Arizona Scour Critical — Countermeasures Installed Fair 1960 10,449
Cane Springs Wash Arizona Scour Critical — Countermeasures Installed Fair 1961 10,203
Natural Corral Wash Arizona Scour Critical — Countermeasures Installed Fair 1961 10,203
Granite Creek Arizona Scour Critical — Countermeasures Installed Fair 1924 9,396
Detrital Wash Arizona Scour Critical — Countermeasures Installed Fair 1982 8,908
Detrital Wash Arizona Scour Critical — Countermeasures Installed Fair 1982 8,855
Wilbur Canyon Arizona Scour Critical — Countermeasures Installed Fair 1963 8,346
Ventana Wash Arizona Scour Critical — Countermeasures Installed Fair 1987 7,758
Granite Creek Arizona Scour Critical — Countermeasures Installed Fair 1921 7,000
Small Wash Arizona Scour Critical — Countermeasures Installed Fair 1900 6,995
Small Wash Arizona Scour Critical — Countermeasures Installed Fair 1938 6,968
San Simon River Arizona Scour Critical — Countermeasures Installed Fair 1923 6,912
Potrero Creek Arizona Scour Critical — Countermeasures Installed Fair 1979 6,783
Cherry Creek Arizona Scour Critical — Countermeasures Installed Good 1967 6,709
Agua Fria River Arizona Scour Critical — Countermeasures Installed Fair 1972 6,675
Verde River Arizona Scour Critical — Countermeasures Installed Fair 1975 6,328
San Pedro River Arizona Scour Critical — Countermeasures Installed Poor 1960 6,156
E Branch Brawley Wash Arizona Scour Critical — Countermeasures Installed Fair 1957 5,668
Cottonwood Wash Arizona Scour Critical — Countermeasures Installed Fair 1948 5,460
Rillito Creek Arizona Scour Critical — Countermeasures Installed Fair 1963 5,205
Niger Canyon Arizona Scour Critical — Countermeasures Installed Fair 1942 5,190
Pinal Creek Arizona Scour Critical — Countermeasures Installed Poor 1920 5,162
Wet Beaver Creek Arizona Scour Critical — Countermeasures Installed Good 1972 4,800
Pinal Creek Arizona Scour Critical — Countermeasures Installed Good 1957 4,750
Church Rock Wash Arizona Scour Critical — Countermeasures Installed Fair 1961 4,533
Dry Wash Arizona Scour Critical — Countermeasures Installed Fair 1933 4,308
Stronghold Wash Arizona Scour Critical — Countermeasures Installed Fair 1933 4,308
Dry Wash Arizona Scour Critical — Countermeasures Installed Fair 1933 4,083

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