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Minnesota Department of Natural Resources 500 Lafayette Road • St. Poul, MN . 55155-40 _ July 10, 2017 Dennis Walsh Mayor, City of Orono P.O. Box 66 Crystal Bay, MN 55323 City Council Exhibit F Minnesota I'll 1i: l OPARTYENTOF NATUML RESOURCES Re: DNR Advisory Report on the Formation of the Carman Bay Lake Improvement District in Orono, Hennepin County Dear Mayor Walsh: The Minnesota Department of Natural Resources has reviewed the petition submitted to create the Carman Bay Lake Improvement District (CBLID) and prepared this Advisory Report in accordance with Minnesota Rules part 6115.0970 subp. 5. Goals of the Proposed Lake Improvement District The stated goal of the CBLID is to manage existing Aquatic Invasive Species (AIS), as well as any future AIS that become established in the bay. Residents of Carman Bay have treated the bay with herbicides for Eurasian Waterm€Ifo€I (EWM) and curlyleaf pondweed (CLP) since 2008, in accordance with a Lake Vegetation Management Plan (LVMP) developed by the DNR for several Lake Minnetonka bays (including Carman), in cooperation with the Lake Minnetonka Association (LMA) and the Lake Minnetonka Conservation District (LMCD). Funding for treatments has been voluntary on the part of residents, sometimes supplemented with grants and other funds provided by the cities, the DNR, and other organizations. Background Information on Carman Bay 1 Carman Bay is a subbasin of upper Lake Minnetonka (27013305). It has a wide connection to the main upper lake, and does not have its own subbasin number. 2 The bay has a surface area of about 294 acres with a littoral area (15 feet deep or less per M.R. part 6280.0100, sub 9) of 187 acres, or 64 percent of the surface area'. Generally, the littoral zone is the part of a lake where rooted aquatic plants can grow, though the maximum depth at which plants can grow depends on water clarity and so varies from lake to lake and even from year to year within the same lake. 3 Several aquatic invasive species have been documented in or near the bay. Eurasian watermilfoil (Myriophyllum spicatum, EWM) and curlyleaf pondweed (Potamogeton crispus, CLP) have been present at nuisance levels for decades. Zebra mussels (Drelsseno polymorpha) were observed in 2010, and the DNR has a record of purple loosestrife (Lythrum salicaria, L. virgatum, and hybrids) and flowering rush (Butornus umbellatus) in the catchment .2 Lake Minnetonka Conservation District tLMCD) Comprehensive Eurasian Watermlifoll and Curly -leaf Pandweed Management Plan, 2013 Minnesota Department of Natural Resources www.dnistate.mn.us AN EQUAL OPPORTUNITY EMPLOYER PRINTED ON RECYCLED PAPER CONTAINING A MINIMUM OF 10% POST -CONSUMER WASTE