Surface Water Management Division
Lost Lake
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Lost Lake (formerly called Devil’s Lake) is located southeast of Maltby between Highway 522 and the Snohomish-King County line. The lake is 12 acres, with a maximum depth of 13.7 meters. The Lost Lake watershed is approximately 149 acres. There is a public boat launch located on the southwest side of the lake. |
2009 lake photo contest runner-up
Lost Lake at Sunset
by Walter Cohee |
Water Quality Information
Summary
Lost Lake has low water clarity, moderate to high nutrient levels, and periodic algal blooms. Water clarity has increased in recent years; however, severe oxygen depletion and increasing nutrients are signs of eutrophication. The lake appears to be at risk of future declines in water quality unless nutrient runoff from the lake shore and the watershed is controlled.
Reports
A comprehensive Snohomish County State of the Lakes Report was produced in 2003 and includes a specific section on Lost Lake. Individual lake updates to this report are provided each year as new data are collected.
Data
Snohomish County Surface Water Management (SWM) together with volunteer lake-monitors have been collecting water quality data for Lost Lake since 1994. Current and historical lake water quality data are available online in SWM's interactive Water Quality Database.
Lost Lake Maps
- Bathymetric Map - this map shows contour lines of equal depth similar to a topographic map. Public access sites are also indicated on each map when applicable.
- Aerial Photo - 2007 aerial photos of the lake with relevant features such as public access sites and nearby roads.
- Watershed Map - this map shows the boundary of the Lost Lake watershed. A watershed is the land area that drains into the lake.
Lost Lake Resources
Contact
Gene Williams, Senior Planner, 425-388-3464 extension 4563
Marisa Burghdoff, Water Quality Analyst, 425-388-3464 extension 4639
Some documents are in pdf format. To read these files you'll need to have Adobe Acrobat Reader installed on your computer.