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Little Lake Johanna (DNR Lake ID number 62-0078 and hydrologic unit code 7010206) is <br />located in Roseville and Arden Hills. This lake has an area of 18 acres and maximum <br />depth of 28 feet. The dominate bottom substrate is not known nor is the abundance of <br />aquatic plants or water quality. <br />Based on the Gillnet catch only, Carp, Black Bullhead, and Black Crappies were found at <br />above local median. Brown Bullhead and Northern Pike were sampled at below local <br />median levels. Yellow Bullhead, Largemouth Bass, Green Sunfish, Pumpkinseed, Bluegill <br />and hybrid Sunfish are know to inhabit the lake based on 1979 test netting. <br />The only recorded water level on Little Lake Johanna is 878.28 feet on August 5, 1976. <br />IV. PROBLEM ASSESS <br />Current data suggests that Lakes Little Johanna and Johanna have water quality issues. <br />Both are included in the Minnesota Pollution Control Agency's (MPCAs) March 31, 2004, <br />proposed Total Maximum Daily Load (TMDL) list. The listing for Little Lake Johanna was <br />due to a stress caused by excess nutrients affecting its use for aquatic recreation. The <br />listing for Lake Johanna was for impacts due to mercury affecting its use for fish <br />consumption. The Lake Johanna listing is a mainly regional expression, so the initial <br />approach will be to complete regional or state-wide mercury TMDL reports. This approach <br />could change based on basin planning activities. U.S. EPA Region 5 understands there <br />must be a federal responsibility for the national and international air -borne components of <br />mercury. Both lakes are also included on the MPCA 2006 Impaired Waters List. <br />This Surface Water Management Plan (SWMP) presents a vision of high quality natural <br />and water resources for the College as its Master Plan (Figure No. 4) is implemented. The <br />SWMP's overall goal is to cooperate with the Cities of Roseville and Arden Hills to improve <br />the quality of both of the campus lakes. Achievement of these goals will deliver good <br />quality stormwater runoff from the campus to lakes and wetlands at acceptable rates and <br />volumes, while reducing pollutant and sediment loadings and stream bed/stream bank <br />erosion and water quality degradation. <br />The success of attaining these goals will be measured by: <br />A. Improving the lake grades for Johanna and Little Johanna in cooperation with the <br />RCWD and the Cities of Roseville and Arden Hills. <br />Northwestern College Master Plan 6 13529.000 <br />Stormwater Management Study <br />