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City Hall
1812 Main St.
P.O. Box 257
Lake Stevens, WA 98258

Lake Management
Picture of Lake Stevens
North Cove
Lake Stevens is a water of the state and is managed by the City of Lake Stevens in partnership with Snohomish County. The lake covers over 1,000 acres and has an average depth of 62 feet with a maximum depth of 150 feet.  The lake's watershed is 4,536 acres and the primary water source feeding the lake are Stevens, Lundeen, Kokanee, and Stitch creeks.  There is a single outfall to the lake that drains into Catherine Creek and then into the Pilchuck River.

Snohomish County Hydrology Site
Lake Health Report 2015-2016

Lake Stevens Eurasian Milfoil Management
Aquatechnex is a fully integrated lake and aquatic plant management firm that operates primarily in the Western United States and Upper Midwest States.  They're team will be evaluating the Eurasian Milfoil growth present in Lake Stevens and will be setting the treatment date and locations.  Please see the attached link for updates and relevant information.


Algae Management
June 2012 algae bloom
Blue-green algae bloom June 2012
The City and County have developed a Phosphorus Management Plan to address how it plans to control high nutrient (phosphorus) loadings in Lake Stevens which is resulting in unwanted algae growth.  The treatment in the plan is to use Alum to reduced the phosphorus levels in the lake close to the naturally occurring levels.  A technical report was prepared by Tetra Tech and can be view at this link.

Algae blooms are a natural occurrence in Lake Stevens and is important to the productivity of Lake Stevens' eco-system.  Algae is part of the food chain that feeds small life forms that in turn provide a food source for fish and so on up the food chain.  In this context most algae are desirable for lakes.

Some algae, such as filamentous green algae and blue-green algae, are not desirable and have resulted in concerns with Lake Stevens.  Both of these types of algaes thrive in a nutrient-rich lake.  The Fiamentous green algae, while generally harmless, can interfere with boater access, recreation, and aesthetics. This type of algae produces thick mats on the water's surface.  Blue-green algae are actually bacteria and are of greater concern than true algae because some species can produce potent toxins.  While not all blue-green algae is toxic, it is best for people and their pets to avoid contact with surface sums whenever a blue-green bloom is suspected.