King County, Washington
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 reportsSeveral 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 Regional Eurasian Milfoil Control Plan (Acrobat PDF, 149KB)
- Noxious Weeds Survey for Five King County Lakes (1999) (Acrobat PDF, 4MB)
- Waterweeds: A Report of Volunteer Survey Results for Fifteen King County Lakes (2000) (Acrobat PDF, 7MB)
- Aquatic Plant Mapping for 36 King County Lakes (1996) (Acrobat PDF, 9MB)
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.
- Introduction: What and Why We Monitor (Acrobat PDF, 485KB)
- 2020 Lake Stewardship Program Monitoring Report
- 2019 Lake Stewardship Program Monitoring Report
- 2018 Lake Stewardship Program Monitoring Report
- 2017 Lake Stewardship Program Monitoring Report
- 2006 Climate and Hydrology (Acrobat PDF, 97KB)
- 2006 Water Quality and Nutrients (Acrobat PDF, 160KB)
- 2006 Chlorophyll and TSI Ratings (Acrobat PDF, 67KB )
- 2004 Annual Report
- 2003 Annual Report
- 2002 Annual Report
- 2001 Annual Report (Acrobat PDF, 4.41MB)
- 2000 Annual Report (Acrobat PDF, 5.04MB)
Volunteer Lake Monitoring Manual
Describes the monitoring protocols to ensure volunteer-collected lake monitoring data meet quality-assurance and quality-control standards.
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 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 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 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.
Lake Steward newsletters archived from 1998 to 2004 are available.
For questions about lakes in King County, please contact email@example.com or call the Water and Land Resources Division front desk at 206-477-4800.