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04-12-22 Agenda Packet
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04-12-22 Agenda Packet
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Growth in Watershed versus Lake LevelsPrior to housing and industrial development north and south of lake that occurred in the late 1970s/early 1980s, the watershed area was as shown below (from 2009 DNR Karth Lake study). In 1974, 1977 and 1978, lake levels per DNR & URS were about 930 feet above sea levelBy 1983, levels had risen to 934+ feet. The lake size increased and there was a substantial lossof trees, sitting in 3 or more feet of water. Temporary pumping occurred in 1984 and 1986 when the levels reach over 936 feet. Pumping brought levels down to 934 feet. Around 2000, Shoreview townhomes were completed, which appears to have expanded the watershed eastward.As of 2009, Karth Lake’s water surface area was 20.5 acres and the watershed area was 117.74 Acres, of which an estimated 35% was impervious surfaces. In 2002, levels reached over 938 feet. Temporary pumping occurred in 2002 and the first permanent pump was installed in 2004.After the first pump failed in 2019, levels rose to almost 937 feet.After the new pump was operated in 2020 and was followed by a drought during 2020‐2021, levels dropped to around 933 feet.
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