Publications Home || Browse by topic || Browse by program || Ecology website

Publication Summary

Our Ecology website has changed, which can cause broken links.
To report these, please contact us with the publication and broken link.


Determination of Significance, Switzler Reservoir Project

Publication number Date Published
18-12-012August 2018
VIEW NOW Determination of Significance, Switzler Reservoir Project (Number of pages: 3) (Publication Size: 737KB)

Trouble viewing? Try these free options.
Author(s) SEPA Responsible Officials: G. Thomas Tebb, Mo-chi Lindblad, and Jerrod MacPherson
Description A determination of significance is a State Environmental Policy Act document which serves as a determination that a proposed project or action may have significant environmental impacts. It will be followed up with an environmental impact study.

To meet existing demands along with new instream and out-of-stream demands, a new Columbia River off-channel surface water storage reservoir would be constructed in
Switzler Canyon, with a peak storage capacity of approximately 44,000 acre-feet,
through construction of a concrete-faced rockfill dam approximately 325 feet in height. Water would be diverted from the Columbia River during periods when water is
The mission of the Department of Ecology is to protect, preserve, and enhance Washington’s environment. To help us meet that goal, please consider the environment before you print or request a copy.

ADA Accessibility
The Department of Ecology is committed to providing people with disabilities access to information and services by meeting or exceeding the requirements of the Americans with Disabilities Act (ADA), Section 504 and 508 of the Rehabilitation Act, and Washington State Policy #188.
Visit Ecology’s website for more information.
Contact Melissa Downes at 509-454-4259 or
Keywords water supply, SEPA, SEPA DNS

State Environmental Policy Act Co-Lead Memorandom of Agreement for the Switzler Reservoir Project

State Environmental Policy Act Environmental Checklist for the Switzler Reservoir Project