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CCP 09-10-2001
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CCP 09-10-2001
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<br />I <br /> <br />;. <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />II <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />, <br />I <br /> <br />9.701 <br /> <br />Josephine and Round lakes both fully support swimmable use classification, <br />according to their TSI, although they are sensitive to increases in phosphorus <br />nutrient loading. However, there is no access to Round Lake for swimming <br />use, Lake Johanna only partially suppons swimmable use classification due to <br />algae blooms and low transparency for a significant portion of the summer. <br />Karth, Little Lake Johanna and Valentine lakes do not support swimmable use <br />classification due to severe and frequent algae blooms and low transparency <br />for most of the summer. Round, Karth, Little Lake Johanna and Valentine <br />lakes have either small surface areas or are quite shallow in average depth and <br />therefore would not be considered likely candidates for swimmable use. <br />However, water quality data in support or non-support of this use is important <br />for wildlife management of these water bodies. <br /> <br />Lake Josephine Assessment Report <br /> <br />The MPCA along with MDNR, Ramsey County Public Works, RCWD and <br />Josephine Lake Association issued a Lake Assessment Report for Josephine <br />Lake in 1998. Pertinent portions from that report are as follows: <br /> <br />(page iii) <br /> <br />A good historical data base is available for assessing trends in water <br />quality of Lake Josephine. These data include 22 years of Secchi data <br />and several years of water chemistry data. Based on an analysis of 22 <br />years ofCLMP, MPCA DNR, Met. Council, Ramsey County, and two <br />environmental consulting firm's Secchi transparency data, Lake <br />Josephine exhibited a significant improvement in transparency over <br />time (R. '" 0,52; p=0.0008). Summer mean Secchi transparency <br />measures ranged from 2.3 to 4.3 feet from ] 975-1979. In contrast, <br />from 1981-1989 summer-mean Secchi ranged from 3.0 to JO.2 feet <br />and from 1990-1998 summer-mean Secchi ranged from 5.2 to 12.1 <br />feet. Summer-mean total phosphorus and ch10rophyll-a concentrations <br />exhibited a decline over this time period as well. <br /> <br />(page 3) <br /> <br />Lake Josephine's watershed is relatively small at about 734 acres, <br />excluding the lake. The vast majority (96%) of the watershed is in <br />urban/residential lake use. This percentage, although not typical for <br />lakes in the North Central Hardwood Forest ecoregion, is rather typical <br />for lakes in the Twin Cities metro area. Little Lake Josephine is about <br />12 acres in size, much of which is covered by cattails and emergent <br />vegetation; however, the open water portion has maximum depth of 25 <br />feet. Originally, about 260 acres drained through Little Lake Josephine <br />prior to entering Lake Josephine. In ] 980, a project conducted by the <br />RCWD. in consultation with E.A Hickok Engineering, resulted in an <br /> <br />City oj Arden Hills. Minnesota <br />Local Water Resource Management Plan <br /> <br />A,ARDEN0101.00 <br />Page 27 <br />
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