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Section 3.2 -- Water Quality Management Plan identifies Lake DeMontreville as a Category I lake, based on its existing and desired recreational uses. Further description of this water quality classification is included in Section 3.2. 4.2.7.5 VBWD Water Quality Management Goals Future development in the Long Lake watershed is more likely to lead to further degradation of Lake DeMontreville's water quality than future development in the Lake DeMontreville watershed, based on current land use plans. Because Lake DeMontreville's current water quality is in conflict with its usage, additional degradation is expected to cause additional conflicts with lake usage. The major source of water, and phosphorus, for the lake is inflow from Long Lake. An additional inflow occurs from Grant Township through culverts under T.H. 36 west of DeMontreville Trail. Additional phosphorus loading to Long Lake from development in its upstream watershed will impact the water quality of Lake DeMontreville. Therefore, reduction of existing phosphorus loading to Long Lake and limitation of increases in future loading may be necessary to protect and/or improve the water quality of Lake DeMontreville. Management plans for Long Lake must be considered when developing management plans for Lake DeMontreville. As shown in Table 5 of Section 3.2 -- Water Quality Management Plan, VBWD's management goal for Lake DeMontreville is restoration of the lake's water quality so that the current and future desired recreational use no longer conflict with the water quality during the g late summer period. VBWD will pursue completion of hydrologic and nutrient budgets for Lake DeMontreville, depending on the availability of funds. VBWD will then establish management goals for the lake. Because the water quality of Lake DeMontreville is largely determined by phosphorus loading from Long Lake, the water quality necessary to achieve Lake DeMontreville water quality goals will be considered when the Long Lake water quality goals am —determined. — 4.2.8 Lake Olson Water Management Plan 4.2.8.1 Location and General Description Lake Olson (DNR #82-103P) is located in subwatershed OLS1, in the northwest corner of the City of Lake Elmo. Lake Olson has a surface area of about 100 acres and a maximum depth of about 20 feet. Lakes Olson and DeMontreville are joined together by a channel, located near the south end of Hill Trail North, which is of adequate capacity to enable them to react to ! runoff as a single lake. The Lake Olson tributary watershed area is 775 acres, including the areas tributary to the Olson Lake Estates Development, and is comprised of subwatersheds OL1 - OL25, and OLSI. Excluding the Olson Lake Estates 486-acre tributary area (subwatersheds OL-1 to OL-12, OL-15, OL-16, and OL-18) the area tributary to Lake Olson is 289 acres. Since Lake DeMontreville (3,577 acres) flows into Lake Olson, the total tributary area is 4,352 acres, including the Olson Lake Estates tributary area, or 3,866 acres, excluding the Olson Lake Estates tributary area. Current inflows to Lake Olson are mainly from Lake DeMontreville. The Lake Olson shoreline is largely in private ownership and is 90% developed. Three - fourths of the Lake Olson tributary watershed is developed or currently under development. The majority of the undeveloped area is located between 40th and 45th Streets North and east 23\82\045\SEC4.RPT\KMH 22 DRAFT: June 23, 1994