Rice Marsh Lake Water Quality Treatment Project

The City of Chanhassen is partnering with the Riley Purgatory Bluff Creek Watershed District to install a stormwater Best Management Practice (BMP) within Rice Marsh Lake Park. The BMP is called a Kraken Filter, and would be installed underground. Stormwater from the downtown Chanhassen area that drains to the lake would now pass through the system, which contains a series of chambers and various filters which would remove up to 63% of Total Phosphorus and 85% of Total Suspended Solids, both of which are pollutants which negatively impact the water quality within Rice Marsh Lake.

This project is a result of the Watershed District’s 2016 Use Attainability Analysis which identified the need for a water quality improvement project within the Rice Marsh Lake and Lake Riley. Many BMPs were analyzed and considered, such as an iron-enhanced sand filtration basin, a subsurface gravel bed wetland, and a modular wetland system. 

  1. Matt Unmacht

    Water Resources Coordinator
    Phone: (952) 227-1168

  2. Ryan Pinkalla

    Water Resources Technician
    Phone: (952) 227-1173

Notify Me Button Opens in new windowThe general project area is below, although the final precise location of the Kraken Filter
is still to be determined.

The project is currently in initial design phase. 

Image showing the project area

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Project Updates

Please check back to this page for more information as this project gets underway.  To receive updates directly via email and/or text message, please sign up with Notify Me!


Tentative Construction Start
September/October 2021
Tentative Construction End
December 2021, Vegetation Restoration Spring 2022