The City has been managing aquatic plants in Lake Stevens since the late 2000s. Management efforts began to treat and manage the spread of Eurasian Milfoil, a noxious weed in the State of Washington. Through years of proactive management, the impact of the Eurasian Milfoil in Lake Stevens has dramatically decreased. The eradication of Eurasian Milfoil has opened the opportunity for other native and invasive aquatic plant growth. Annually, the City surveys the Lake to evaluate the aquatic plant distribution and species to develop a treatment plan.

2023 Aquatic Plant Survey of Lake Stevens

For More Information

• 2010 Eurasian Watermilfoil Density Map
• Integrated Aquatic Vegetation Management Plan
• Press Release (March 2011)
• Project Information and Status
• Triclopyr Fact Sheet

Snohomish County Hydrology Site

Lake Health Report 2015-2016