Lower Granite Lock And Dam - East Levee Reservoir Report
Last Updated: December 15, 2025
The Lower Granite Lock and Dam - East Levee, located in Lewiston/Clarkston, Washington, is a critical Federal structure managed by the US Army Corps of Engineers.
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Summary
The dam is situated on the Snake River and serves multiple purposes, including flood risk management and water resource control. With a high hazard potential, the dam is continuously monitored and maintained to ensure its structural integrity and to manage potential flood risks effectively.
USACE implements various risk management measures to address the challenges associated with dam operations, including regular inspections, maintenance, and working closely with local emergency managers and the public to raise awareness and preparedness for dam-related emergencies. Additionally, the agency regularly updates the emergency action plan for the dam and coordinates with stakeholders to ensure effective response strategies are in place. Despite the limitations of dams in completely eliminating flood risk, USACE strives to mitigate potential issues and ensure the safety and security of the surrounding communities.
The dam's role in managing water levels and mitigating flood risks is crucial in the region, especially during severe weather events that can lead to increased water flow. USACE's dedication to proactive risk management and ongoing communication with stakeholders underscores the importance of the Lower Granite Lock and Dam - East Levee in safeguarding the local area from potential flooding disasters and ensuring the sustainable management of water resources in the region.
River Or Stream |
SNAKE RIVER |
Primary Dam Type |
Earth |
Hazard Potential |
High |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Lower Granite Lock And Dam - East Levee
Steelhead Park