3.1 Water Quality

  1. The water quality in Gleason Lake since 1998 has consistently been scored in the C/D grade range on the District’s annual lake report cards.  The mean summer 2004 total phosphorus concentration was 108 Mu-g/L, well in excess of the District’s interim 80 Mu-g/L goal.   Based on this monitoring history Gleason Lake’s water quality is not supportive of swimming.   The proposed state standard for shallow lakes is 60 Mu-g/L; the long-term goal for Gleason Lake is to in the long term achieve that standard or better.   Phosphorus loading reductions would be necessary to achieve either of the desired interim or long-term goal in-lake phosphorus concentrations.   Little or no data is available for Hadley, Kreatz, and Snyder Lakes.  However, the Regional Team has recommended a goal of 10 percent reduction in TP for these lakes.
  2. Development, redevelopment, and reconstruction in the subwatershed will increase nutrient and TSS loads from the watershed as well as increasing the volume of stormwater runoff, potentially further degrading water quality in Dutch Lake and streams and wetlands in the subwatershed.
  3. Gleason Creek conveys significant phosphorus and sediment loads downstream, and dissolved oxygen can fall below the state standard during low flows.
  4. The Gleason Lake Management plan identified some areas of shoreline erosion on Gleason Lake that could be contributing to reductions in lake water clarity and increased pollutant loading.