HOWARD A HANSON RESERVOIR NEAR PALMER

RESERVOIR LEVELS
December 21, 2024
1,206 ft 47.28, -121.79


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Howard A. Hanson Dam, located in Auburn, Washington, is a rockfill dam primarily designed for flood risk reduction along the Green River. Completed in 1962 by the US Army Corps of Engineers (USACE), the dam has a hydraulic height of 220 feet and a structural height of 235 feet, with a maximum storage capacity of 136,700 acre-feet. While the dam plays a crucial role in reducing flood risks, extreme rainfall events could still necessitate controlled releases through the outlet tunnel or spillway to prevent overtopping and potential failure.

USACE has implemented numerous risk management measures to ensure the dam's safety and reduce risks to life safety and property. This includes regular inspections, monitoring instrumentation, and maintenance activities to address any potential concerns. The agency also collaborates with local emergency managers to update the Emergency Action Plan annually, conducts emergency exercises, and hosts stakeholder meetings to keep the community informed. Despite the low likelihood of dam failure scenarios, USACE remains committed to safeguarding the dam and mitigating potential risks to downstream communities in Auburn, Kent, and beyond.

Overall, Howard A. Hanson Dam remains a vital infrastructure for flood risk reduction in the region, with USACE's ongoing efforts to maintain the dam's integrity and ensure its resilience in the face of extreme weather events. Through continuous monitoring, maintenance, and collaboration with local authorities, the dam serves as a critical asset in protecting communities from potential flooding disasters.

Lake Or Reservoir Water Surface Elevation Above Ngvd 1929, Ft 24hr Change -0.24%
Percent of Normal 100%
Minimum 1,068 ft
2007-12-05
Maximum 1,188.2 ft
2009-01-10
Average 1,084 ft
Hydraulic_Height 220
Drainage_Area 221
Year_Completed 1962
Nid_Storage 136700
Structural_Height 235
Primary_Dam_Type Rockfill
Surface_Area 20000
River_Or_Stream GREEN
Dam_Length 500
Hazard_Potential High
Nid_Height 235
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