Coon Creek Watershed District Total Maximum Daily Load (TMDL)

This Total Maximum Daily Load (TMDL) addresses macroinvertebrate biotic integrity and Escherichia coli (E. coli) impairments in the Coon Creek Watershed District (CCWD), more specifically in Coon Creek, Sand Creek, Unnamed Ditch (Pleasure Creek), and County Ditch 17 (Springbrook Creek). A TMDL is defined as the maximum quantity of a pollutant that a water body can receive and continue to meet water quality standards for designated beneficial uses. Thus, a TMDL is the sum of allowable point source and nonpoint source pollutant loads in a watershed, plus a margin of safety (MOS). The CCWD is part of the Mississippi River – Twin Cities Watershed (HUC 07010206). The CCWD is approximately 107 square miles, and overlies portions of seven cities including Andover, Blaine, Columbus, Coon Rapids, Fridley, Ham Lake, and Spring Lake Park in Anoka County. The goal of this TMDL is to quantify the pollutant reductions needed to meet Minnesota's water quality standards for macroinvertebrate biotic integrity and E. coli for the impaired stream reaches. This TMDL was established in accordance with Section 303(d) of the Clean Water Act and provides wasteload allocations (WLAs) and load allocations (LAs) aimed to restore aquatic life and aquatic recreation designated uses.
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Minnesota Water Research Digital Library
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