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. George Bender

    Assistant City Engineer

  2. Matt Petite

    Engineering Technician/ Construction Manager
    Phone: (952) 227-1166 Cell: (612) 358-7085

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Project Updates

May 24, 2022

Rice Marsh Lake trail will be closed Wednesday and Thursday, May 25 – 26th
The contractor will be removing and replacing sections of the trail that were impacted by the construction project. Weather permitting, the trail will be repaved and ready to re-open Thursday evening. 

May 5, 2022

The contractor has started operations for site restoration consisting of final grading, soil amendments, and rain garden construction. This work is tentatively scheduled to be completed by Wednesday, 5/18/22.

Work will then tentatively begin on Thursday, 5/19/22 to repair the trail and the addition of ADA improvements for the ped ramp off Dakota Lane. The paving of the trail is expected to be completed by Friday, 5/19/22 and concrete work is expected to be done by Tuesday 5/24/22.

Final seeding and final restoration of the project area is scheduled to start on Monday, 5/30/22 and be done on Wednesday, 6/1/22. Please keep in mind that the dates listed are weather permitting and are subject to change.

December 22, 2021

Work has been completed for the season with the vast majority of the required effort being done.  Traffic control will be picked up early next week. The construction fence will be left in place at the segment of trail coming off Dakota Lane, down into the park. The trail will be temporarily restored with gravel, until next spring, when it will be paved. Restoration and remaining punch list work will also take place in the spring.

December 8, 2021

The installation of the water filtration structures has been completed and work on the storm sewer is currently ongoing. Utility work is planned for the next two weeks in this area. The trail going through the park is currently closed to the east and west of the project where the trail is adjacent to the project limits. Please proceed with caution, look for signs, and avoid this area from 7:00 a.m. to 6:00 p.m. on weekdays and from 9:00 a.m. to 5:00 p.m. on Saturdays. During these hours if construction is ongoing there may be limited to no access on the trail and pedestrian traffic may not be able to travel through the park inside of the project limits.


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Construction Start
November, 2021
Construction End
December, 2021 
Vegetation Restoration

 Spring, 2022