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■ The lake is too small for motorized craft. Therefore, residents support the City's ordinance regarding no motorized craft on the lake. Future urbanization along the shores and in the watershed of Echo Lake will likely lead to further degradation of its water quality. As part of the Echo Lake Addition development located adjacent to the east and south shores of Echo Lake, additional ponding areas were created which will provide treatment of stormwater runoff prior to its discharge to Echo Lake, 4.2.3.6 VBWD Water Quality Management Goals Echo Lake is identified as a Category III water body in Section 3,2 -- Water Quality Management. Plan, based on the lake's existing water quality and its existing and desired recreational uses. A Category II water body supports fishing, aesthetic viewing activities and wildlife observation. Further description of water quality categories is included in Section 3.2. The current and expected use of Echo Lake conflict with its current water quality. Future development in the watershed is likely to exacerbate the conflict. Section 3.2 shows that Echo Lake is to be managed to restore its water quality to remove the conflict. VBWD will complete hydrologic and nutrient budgets for Echo Lake under existing and future watershed conditions, depending on the availability of funds. VBWD will also continue to monitor the water quality of Echo Lake, at least once every five years. Then, using the study and water quality monitoring results, VBWD will review and possibly revise its management goals for Echo Lake. 4.2.4 Weber Pond Water Management Plan 4.2.4.1 Location and General Description Weber Pond is a 7.5-acre pond (DNR #82-119W) located in Subwatershed WEB1, in the City of Mahtomedi, adjacent to the south side of 60th Street North. The pond is split into two marts -by the -old -stxeetcargraxie,- which -therefore-acts-as a -dam —,The -Weber -Pond laical -tributary area is 139 acres, which is comprised of Subwatersheds WEB1 through WEB8. Since the Echo Lake outflow (190-acre tributary area) enters Weber Pond, the total tributary area of Weber Pond is 329 acres. Figure 2-3 shows the tributary area. 4.2.4.2 Drainage Patterns and Stormwater Issues Outflows from Echo Lake cross 60th Street, discharging into the northwest corner of Weber Pond. The outlet for the larger (6.5 acres), northwest part of the pond is a pipe through the streetcar grade. The outlet for the southeast (downstream) part of Weber Pond is a ditch which begins to overflow at Elevation 973,7. This outflow then crosses Lincolntown Avenue into the City of Pine Springs, eventually discharging to Long Lake. The DNR's ordinary high water elevation (OHW) for Weber Pond is 974.9. The Weber Pond outlet through the streetcar grade collapsed in the fall of 1991, which resulted in the flooding of 60th Street North. Emergency measures were taken on November 20, 1991, The emergency measures consisted of removing the collapsed existing outlet; which was comprised of 50-gallon drum segments tied together, and digging a narrow channel with steep side slopes to replace the collapsed outlet. As approved by VBWD, the City of Mahtomedi installed a 24-inch diameter pipe in June, 1992, as a temporary measure. The 24-inch diameter pipe is approximately the same size as the previous outlet, The temporary pipe will be removed when a permanent outlet is constructed. 23\82\045\SEC4.RPT\KMH 10 DRAFT: June 23, 1994