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WDFW
WDFW has authority for issuing hydraulic project approval (HPA) in the State of Washington. As a rule of thumb, if your proposed action might affect the bed, banks, and/or nature of flow, an HPA is required (even if the action is above the ordinary high water line)
does not generally write permits for removing LWD from streams. Relocation/repositioning of LWD is permitted
timing of that work is dependent upon many factors such as fish species present, life history stages that may be impacted (spawning, rearing, etc.), what habitat exists at the site or in close proximity, extent of the work.
work is evaluated on a case by case basis to make a determination on specific timing. General timing dates are available at WDFW’s website under "Habitat", in the back of the Gold and Fish Pamphlet. Information regarding the RCW and WAC's that require an HPA be secured for work that will, "use, divert, obstruct or change the natural bed or flow of state waters” is available on the WDFW website
If in doubt about applicable regulations, the Washington State Office of Regulatory Assistance for help in making this determination. 1-800-917-0043 E-mail: assistance@ora.wa.gov, Web: www.ora.wa.gov.