Consultant's Report - Minnesota State Legislature

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MINNESOTA DEPARTMENT OF NATURAL RESOURCES Feasibility Study to Limit the Spread of Zebra Mussels from Ossawinnamakee Lake scenario, the public is encouraged to report suspected locations ofzebra mussels in areas around the Ossawinnamakee Lake. This scenario allows the public to be an active participant in the control process. Objective 2 Ossawinnamakee Lake has one outlet structure that represents the only in-water dispersal point for zebra mussels from the lake to Pelican Brook. Protection ofthis outlet from the population in the lake represents the most critical control point for downstream transport. Several treatment alternatives could be applied to control the movement out of the lake at the outlet structure; however, the size and anticipated flow rates through the structure present a challenge for implementation of a control strategy that is feasible to construct and economically responsible to operate. As an alternative to an aggressive solution at the outlet structure, a more passive system could be implemented at the exit ofMuskie Bay. Under this scenario, a pelmeable barrier could be employed that would allow for the movement ofwater but would restrict the movement ofinwater organisms, including veligers. A barrier similar to the Marine Life Exclusion System manufactured by Gunderboom, Inc. (discussed in Section V) may be a viable option. A physical barrier of this type would encompass the entire water column at the exit area of Muskie Bay (Figure VI-I). The barrier would protrude slightly out of the water and stretch to the bottom of the lake. The barrier would be moored into place presumably at each shore and also be anchored along the bottom of the lake to exclude mussels from the outlet area oflake (see Figure V-2 in Section V). VI-12 Alternatives Analysis and Recommendations
Loke MINNESOTA DEPARTMENT OF NATURAL RESOURCES Feasibility Study to Limit the Spread of Zebra Mussels from Ossawinnamakee Lake Outlet Structure Figure VI-1. Permeable Barrier Location Permeable Border Muskie 80y FIGURE VI-1 Figure VI-I displays a conceptual plan view that illustrates the potential location of the permeable barrier system. This type ofphysical dispersal control strategy has several advantages that would aid the zebra mussel control efforts. These advantages include relatively low maintenance, reduced on-site staff time, limited moving parts, minimal utility costs, and the capability to pass large volumes of water. Disadvantages of this system include the likelihood that floating debris will require routine but random removal, exclusion ofboat traffic to the outlet area. of the lake, potential blockage of desirable species movement into the area of Ossawinnamakee Lake downstream of Muskie Bay and upstream of the outlet structure, and possible limitations ofcertain chemical treatments due to clogging. Objective 3 While evaluating the downstream movement of zebra mussels, it was determined that control of the population within Ossawinnamakee Lake in addition to control of zebra mussels that are dispersing or moving downstream is critical. While the size of the lake can present a logistical challenge for many of the evaluated treatment alternatives, it is believed that measures targeting the adult populations established in the lake may reduce the veliger densities that represent the probability ofdownstream dispersal. VI-13 Alternatives Analysis and Recommendations
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List ofTables MINNESOTA DEPARTMENT
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I. Introduction Purpose MINNESOTA D
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Feasibility Study To Limit the Spre
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MINNESOTA DEPARTMENT OF NATURAL RES
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Hydrological Characteristics MINNES
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Outlet Structure MINNESOTA DEPARTME
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lBhsl Nllrtq Osso'winnomakee Pelica
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Page 28 and 29: Age and Growth MINNESOTA DEPARTMENT
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./}' 03/16/2005 14:40 FAX 217585189
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Zebra Mussel Feasibility Study-Main
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FINAL REPORT OF THE EFFECTS OF CUTR
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Limitations in this data set hav.e
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Appendix 1. Development of D. polym
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Figure 2 demonstrates that hatching
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Experimental designs were modified
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Pre-fertilization andpost-fertiliza
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Expt Chemical 1 2 3 Table 3. Summar
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Appendix 4: Effect of Exposure Time
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Aquatic invertebrates in upper Peli
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In contrast, fall sampling revealed
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Lake Ossawinnamakee and Pelican Bro
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VII-F. Meeting Summaries
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Rich Rezanka would like us to refer
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VII-G. List of Abbreviations Used
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VII-H. Glossary of Terms
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Secchi disc MINNESOTA DEPARTMENT OF
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Consultant's Report - Minnesota State Legislature

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