2019 marked the completion of a large scale water quality improvement project designed to removed excess nutrients form stormwater prior to it discharging into Golden Lake. Golden Lake is located in the City of Circle Pines and has been designated as being impaired by nutrient contamination. Excess nutrients lead to high algae growth and low water clarity. This project was completed by a partnership of the City of Circle Pines ($70,000) and the Anoka Conservation District ($12,000) with financial contributions from the Rice Creek Watershed ($50,000) District and the Clean Water Fund of the Clean Water Land and Legacy Amendment ($467,968)
Although it looks like little more than a sand volley ball court, the project relies on precise chemistry and physics. The project pumps water from a stormwater pond just upstream of Golden Lake and directs that water through a sand filter that is enhanced with iron filings. The iron filings chemically bind to the nutrient pollution. The clean, filtered water discharges to an old ditch alignment that goes to Golden Lake. When functioning per the design, the project should remove 40-60 pounds per year of phosphorus for 25 years, which gets us 50% of the way to our goal for Golden Lake.
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