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• Reshanau Lake Management Plan L Introduction During the summer of 2004, a number of residents, who own property on Reshanau Lake, observed that the submerged aquatic vegetation (SAV) growth that year was considerable and that the SAV growth had made the Lake less desirable and less usable than previous years. The SAV that dominates the lake is Potomogeton crispus (curlyleaf pondweed). On August 20, 2004, a meeting was held by individuals who own property on Reshanau Lake to consider what options were available to make improvements to the quality of the Lake. Representatives from The DNR and the Rice Creek Watershed District were present and spoke about issues related to the Lake. In summary, the Lake is not in a desirable state. No objective measurements had been made on the Lake in some time; however, it is believed that the lake could be improved through the efforts of a variety of individuals and organizations. A lake management improvement partnership is being formed with property owners on Reshanau Lake, other users of Reshanau Lake, property owners in the contributing drainage area of Reshanau Lake, the Rice Creek Watershed District (RCWD), and other governmental and regulatory agencies with responsibility for Reshanau Lake. Figure 1 shows the drainage area for Reshanau Lake. On, October 2, 2004, a group of property owners met with a representative of the RCWD and Department of Natural Resources (DNR) to begin the preparation of a comprehensive plan to improve the quality of Reshanau Lake. II. Problem Statement Reshanau Lake is highly eutrophic (meaning that there is an excessive amount of phosphorus and algae growth). The lake also has a high density of curlyleaf pondweed growing throughout the basin. The curlyleaf pondweed has two main problems: 1st it grows to the surface and creates a canopy that is nearly impassable by recreational watercraft, 2nd it dies in late June to early July which will send a pulse of total phosphorus (TP) into the water column that triggers a nuisance algal bloom. This algal bloom turns the water dark green and inhibits any type of water contact activity. The City of Lino Lakes owns a park on the south shore that has a public swimming beach that gets very limited use partially because of the nuisance algal blooms. III Management Goals The management goal set for Reshanau Lake is to reduce the abundance of curlyleaf pondweed and increase the amount and diversity of native SAV species. Another goal is to reduce the in -lake phosphorus concentration to 60 parts per billion (ppb). This phosphorus level would reduce the frequency and duration of algal blooms and increase the recreational use of the lake. G: \Admin \Board \Agenda Paks \2005 Agenda Paks \2005 -04 -13 \Reshanau mgmt plan.doc2