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TO; <br />FROM; <br />DATE: <br />SUBJECT: <br />Planning Commission <br />Jeanne Mabusth# Zoning Administrator <br />October 30, 1980 <br />#586 Speeter/Henninger, 659 Minnetonka Highland Lane - CUP <br />Conclusions suggested from comments of District Limnortogist <br />1. There was no major impact of an'environmental nature to the main <br />lake or the lagoon by the applicants removing the culvert and creating <br />a 8’ to 10* wide channel. Although the applicants say there is a big <br />difference, the limnologist states the effects are minimal. <br />2. At this point, it vrould be best for Lake Minnetonka to allow the <br />channel to remain with rip rap along sides of bank. There would be <br />greater harm to the lake if the City was to require the channel to <br />be filled in and the culvert replaced. <br />3. Existing rip rap will prevent additional bank erosion. Siltation <br />at the mouth of the lagoon is caused by drainage coming down the steep <br />slope through tiling and washing out over 25* of unprotected soil. <br />Rip rap should be placed along the 25* corridor to prevent erosion. <br />4. Presently, the lagoon is unnavigable. The original DNR permit <br />allowed removal of some 740 cubic yards of muck and silt or 4* of <br />the lagoon's bottom. The dredging area covered a 25* wide lagoon <br />and 200 lineal feet of shoreline. The erosion of the banks since <br />1967 has caused the lagoon to increase to approximately a 50* width <br />and siltation has made the lagoon unnavigable. If erosion and siltation <br />is not corrected, dredging will continually be required to make lagoon <br />navigable. <br />Options open to Planning Commission: <br />1. To approvd of CUP to allow permanent bridge to be constructed <br />across channel subject to the following conditions: <br />a) Both applicants continue to maintain permanent dock on island. <br />b) Speeter to acquire permanent access easement through Henninger <br />property to reach dock. <br />c) City will not approve of dredging the lagoon area. Lagoon to <br />remain unnavigable and in its present state. <br />d) City to require rip rap at mouth of culvert to prevent further <br />erosion and siltation. <br />(1 <br />; : <br />* ; <br />♦ <br />IT <br />A