In collaboration with the University of Minnesota St. Anthony Falls Laboratory, City of Stillwater and MN DNR Waters and Fisheries, an iron-enhanced sand filter was designed to remove approximately 118 pounds of total phosphorous per year from an area of Stillwater that drains to McKusick Lake and ultimately to the St. Croix River.
Project Cost
Clean Water Grant = $158,800
Total project budget = $298,462
The project is located in the Settler's 5th Addition off of Morgan Ave in Stillwater.
The project will reduce phosphorous from a contributing drainage area of 1,200 acres by harvesting stream water from an offline constructed settli...ng pond. Stream flow will fill the settling pond to a designated elevation above the intake pipe at which time the pump will convey flow into the existing pretreatment cell of the pond. After pretreatment, the stormwater will flow through the iron-enhanced sand filter, and discharge back to the tributary stream through a newly constructed outlet structure.
The project was installed October 2013. The first year of operation in 2014 was used to learn optimal performance of the system and make any necessary final installation modifications. Performance monitoring will continue for the next several years.
- Clean_Water_Story_Iron_Enhanced_Sand_Filter
- Iron Enhanced Sand Filter Presentation 10-18-2016 Presentation from the 2016 Water Resources Conference
- 2014 Performance Summary Presentation
- 2015 Performance Summary
- 2016 Performance Summary
- 2017 Performance Summary
- 2018 Performance Summary
Construction Photos
