Any person intending to construct or modify any dam must submit plans and specifications and a construction inspection plan for review and approval by the department.
The Environmental Permit Handbook is a website developed by the Office for Regulatory Innovation and Assistance (ORIA) that contains information about Washington State and Federal environmental permits, approvals, and licenses in a handbook like format.
A Dam Safety Construction Permit is required before constructing, modifying, or repairing any dam or controlling works for storage of 10 or more acre-feet of water, liquid waste, or mine tailings.
Regardless of the proposed use to be made of the impounded waters, construction of any dam or dike which will be capable of impounding water to a depth of 10 feet or more at any point, or will impound a volume of 10 acre-feet or more at normal pool level, may not be started until a reservoir permit for such construction has been obtained from the Department of Ecology.
This requirement is applicable to any proposed impounding structure which obstructs a stream or watercourse and to any excavation and/or dike to be built off-channel from any stream or watercourse. This is also applicable to any impounding structure which will increase the depth or capacity of any existing reservoir such that it equals or exceeds the above standards.
For more information, please read General Information Relative to Reservoir Permits
Woodland Estates Dam/Thurston County
Sam's Dam in San Juan
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