Waterline, the quarterly newsletter of the Washington State Lake Protection Association, advocates lake protection, values lakes as a resource, and informs members on activities of the organization. It links varied interests in lakes and encourages readers to approach lake management from a broad perspective. It provides information on new technology.

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Articles in the newsletter include new emerging lakes’ issues, new technology and projects; news from state agencies about lakes’ programs, grants or conferences; reports from the Board of Directors about projects or issues addressed; and more.