Cold Spring Southwest Stormwater Infiltration Project
The development of a P8 water quality model for the city of Thief River Falls to target locations for implementation projects.
Stormwater reduction project to install infiltration areas to treat runoff in the city of Cold Spring. This consisted of infiltration trenches that treated the first flush of stormwater. This project has resulted in an estimated annual reduction of 44 lbs of phosphorus and 2761 tons of sediment.
LOCAL LEVERAGED FUNDS
The City of Cold Spring is looking to retrofit 24 acres of existing development within a 138 acre subcatchment of the City to improve the water quality of Cold Spring Creek, a designated trout stream. The large amounts of hard surfaces within the subcatchment area do not allow for rainfall or snow melt to soak into the ground. The stormwater carries with it sediment, bacteria, automotive fluids, and other pollutants. Cold Spring staff has frequently witnessed sediment plumes, the color of chocolate milk, at the storm sewer outfalls. The goal is to reduce the pollutant load (chocolate milk colored discharge) currently entering the Creek from this area by capturing and treating the first one-quarter inch of rainfall coming from the impervious surfaces. Water quality Best Management Practices will include bioretention basins and/or infiltration trenches.