SNOFLO



DEXTER DAM

RESERVOIR LEVELS
Rock, Soil Dam Middle Fork Willamette River
April 21, 2025


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Dexter Dam, located on the Middle Fork Willamette River in Oregon, was completed in 1955 by the US Army Corps of Engineers for flood risk reduction. Standing at 117 feet tall, the earth dam has a maximum storage capacity of 29,900 acre-feet and serves multiple purposes including hydroelectric power generation, irrigation, navigation, and recreation. Despite being classified as a high hazard potential dam, a 2015 risk assessment determined the overall risk associated with Dexter Dam to be low, with no immediate need for modifications.

USACE continues to monitor and assess the dam's condition through routine inspections and instrumentation, with a focus on earthquake preparedness and emergency response plans. While the dam greatly reduces flood risks for the region, it cannot eliminate the potential for flooding during extreme weather events. The agency is committed to ongoing risk management measures, including updating the Emergency Action Plan, conducting dam safety exercises, and increasing community awareness of flood risks associated with the dam. Overall, Dexter Dam remains a critical infrastructure for flood protection in the Willamette Valley, supported by comprehensive risk assessments and proactive risk reduction strategies.

Year_Completed 1955
Dam_Height 65
River_Or_Stream MIDDLE FORK WILLAMETTE RIVER
Dam_Length 2765
Primary_Dam_Type Earth
Surface_Area 1025
Hydraulic_Height 60
Drainage_Area 996
Nid_Storage 29900
Structural_Height 117
Hazard_Potential High
Foundations Rock, Soil
Nid_Height 117
       

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