Carnelian-Marine-St. Croix Watershed District Multi-Lakes Total Maximum Daily Load Implementation Plan

The TMDL addresses ten lake impairments within the Carnelian-Marine-St. Croix Watershed District (CMSCWD). The ten lakes are listed on the 2010 EPA's 303d list of impaired waters due to excess nutrients: East Boot, Fish, Goose, Hay, Jellum's, Long (in Scandia), Loon, Louise, Mud, and South Twin. The following phosphorus sources were evaluated for each lake: watershed runoff, feedlots, subsurface sewage treatment systems (SSTS), loading from upstream lakes, atmospheric deposition, and internal loading. The phosphorus source inventory was then used to develop a lake response model for each lake, and these models were used to determine the phosphorus reductions needed for the lakes to meet water quality standards. The table below summarizes the TMDL load reduction goals for each lake.