2017 Monitoring Stormwater Retrofits in the Echo Lake Drainage Basin Report

This report presents an evaluation of the effectiveness of a stormwater retrofit along the Aurora Corridor in the Echo Lake drainage basin. The study was designed to address data gaps by the Washington State Stormwater Work Group (SWG) in the effectiveness of stormwater treatment technologies used in the Puget Sound Region. For more information visit King County's project page

Surface Water Master Plans

The Master Plan guides the City’s Surface Water Utility. The City published its first Surface Water Master Plan in 2005, and in 2011, City Council adopted the 2011 Master Plan to address the changing needs of the City.

In preparation for the expiring 2011 Master Plan, the Utility has created an updated master plan that looks ahead to the next five to 10 years. For more information, please visit the 2018 Surface Water Master Plan Update page.

SWM Master Plan Open House 9.8 (3)Residents provide feedback at an open house

Basin Characterization Reports

The City has completed basin characterization reports for all of the City’s watersheds. These reports include a description of the basin and its aquatic resources including streams and wetlands.

Basin Plans

Basin plans are watershed-specific plans to reduce flooding, improve water quality, and enhance stream and wetland habitat. Between 2009 and 2015, the Utility completed basin plans for the 6 major watersheds in Shoreline:

BasinsShoreline Watersheds (Click on Map to view larger image)

Water Quality Reports

2016 Freshwater Assessment Report

This report summarizes water quality data collected over an 8 year period between 2002 through 2009. Comparison of future data to the baseline data will help track long-term water quality trends and determine if current programs designed to improve water quality are effective.

2016 Echo Lake Aquatic Vegetation Report

The Washington State Department of Ecology, in coordination with the City of Shoreline, conducted an aquatic vegetation survey at Echo Lake in June 2016. The survey revealed that Echo Lake contains nine native vegetation species and three non-native species.

2009 Fresh Water Assessment Report

This report summarizes water quality data collected over an 8 year period between 2002 through 2009. Comparison of future data to the baseline data will help track long-term water quality trends and determine if current programs designed to improve water quality are effective.

2009 Bioassesment Report

A biological assessment of City streams was conducted in 2003 and 2007, using macroinvertebrates (stream bugs) as indicators of health in Thorton, McAleer, Boeing, and Storm creeks.The report found that all streams are severely or extremely impacted by urbanization.

TwinPonds2Twin Ponds, part of Thornton Creek watershed