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Using the best available scientific information, the Lake Stewardship Program publishes reports, recommendations and management plans to better protect the water quality and ecosystem integrity of the small lakes.

Science Section document search: lake related documents

Aquatic plant reports

Several surveys for aquatic plants have been carried out in King County lakes. While native plants were included in these surveys, the main goal was to find populations of non-native invasive plants and document their abundance in each lake included in the efforts.

King County lake monitoring reports

An annual report of King County lake data collected by volunteer monitors, including a section on climate and hydrology, nutrients, trophic state index and land use, and a presentation of water quality by individual lake. From 2005 onward, the reports discuss trends and conditions at all monitored lakes. Individual lake data can be viewed and downloaded online on the Lakes Descriptions and Data page.

Volunteer Lake Monitoring Manual
Describes the monitoring protocols to ensure volunteer-collected lake monitoring data meet quality-assurance and quality-control standards.

Cottage Lake

Cottage Lake Phosphorus reduction Project

Cottage Lake Aquatic Weed Management Fund Grant Final Project Report (Acrobat PDF, 7.13 MB)  
Final report to Washington Dept. of Ecology describing the results of a grant project to eradicate acres of Eurasian milfoil or Myriophyllum spicatum in Cottage Lake.

Lake Hicks

Lake Hicks Alum Treatment Project State Environmental Policy Act (SEPA) Environmental Checklist (Acrobat PDF, 118KB)
This document outlines the potential environmental impacts of the proposed alum treatment.

Lake Hicks Alum Treatment Project SEPA Determination of Non-Significance (DNS) (Acrobat PDF, 20KB)
A determination by King County that the proposed project will not have a significant environmental impact.

Pipe and Lucerne Lakes

King County is working to remove hydrilla, a Class A noxious weed, from Pipe and Lucerne Lakes, located in the cities of Maple Valley and Covington, Washington.  For surveys and annual reports describing our progress, please see the Pipe/Lucerne Hydrilla Eradication Project reports.

Lake Sawyer

Lake Sawyer Management Plan
Reports on the condition and water quality mechanisms affecting Lake Sawyer near Black Diamond and lays out long-term goals and a plan to maintain the quality of the lake.

Spring Lake

Spring Lake Aquatic Weed Management Fund Grant Final Project Report (Acrobat PDF, 18.4 Mb)
Final report to Washington Dept. of Ecology describing the results of a grant project to eradicate and control four primary weeds: Myriophyllum spicatum (Eurasian watermilfoil), Lythrum salicaria (purple loosestrife), Iris pseudacorus (yellow-flag iris) and Nymphaea odorata (fragrant waterlily), for in-water work (e.g. surveys), project reports, and education and outreach.

Water Quality Trend Report (Acrobat PDF, 2,023KB)

Newsletter archive

Lake Steward newsletters archived from 1998 to 2004 are available.

For questions about lakes in King County, please contact or call the Water and Land Resources Division front desk at 206-477-4800.