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by the Lake DeMontreville/Olson Association. The data suggest that a temporary reduction in the lake's algal population occurred during July of 1991 as a result of the algicide treatment (see Figure 4-8). Problems with aquatic vegetation in recent years necessitated chemical treatment in private beach areas around the lake. Heavy growths of Curleyleaf Pondweed occur each year during June and growths of Northern Milfoil occur during July through August. The lake was chemically treated to control weeds during 1991 through 1993. Specifically, an area that included 2,959 feet of shore and extending approximately 150 feet from shore was chemically treated. This is the maximum allowed by the DNR, which is 10% of the littoral area. Treatment was completed by a professional, and coordinated by the Lake DeMontreville/Olson Association. 4.2.7.4 Public Use and Related Water Oualitv Concerns Lake DeMontreville is very heavily used for a wide variety of recreational uses. These uses include swimming, fishing, powerboating, waterskiing, canoeing, sailing, and passive uses by lake residents and park attendees. A public boat access was constructed in 1983 on the northwest shore of Lake DeMontreville, off DeMontreville Trail (County Road 13). Since Lake DeMontreville and Lake Olson are joined by a channel, the access can also be used for Lake Olson. The number of individuals accessing the lake is limited by the 17 parking spaces.,at the public access. However, residents report that more than 17 vehicles park at the public access. A DNR recreational survey completed in 1980, prior to construction of the public access, indicated fishing pressure in the lake was 104.6 angler -hours per acre, which is over two times the Metro Region median. Boat anglers comprised approximately two thirds of all anglers. Although the lake does not have a public swimming beach, the lake is heavily used for swimming. Residents have private swimming beaches, which receive heavy usage during the summer months. Swimming lessons are offered at the lake each summer, and from 10 to 20 individuals generally participate. Area parks and trails increase the usage of the lake by the public. DeMontreville Park is located northeast of the lake. The park contains ball fields and soccer fields, in addition to space for passive recreational activities. Also located near the lake is the DeMontreville Wildlife Area. This is a wildlife park with trails to enable people to enjoy the natural surroundings and view the wildlife. The City of Lake Elmo and Washington County have made plans to establish walking/biking trails along roads around the lake. Washington County constructed a trail along a portion of County Road 13. Two local organizations are currently involved in efforts to preserve and improve Lake DeMontreville's water quality: the Lake DeMontreville/Olson Association and the Tri-Lakes Association. The Lake DeMontreville/Olson Association consists of residents of Lake DeMontreville and Lake Olson, while the Tri-Lakes Association also includes residents of Lake Jane. The current and expected future use of the lake conflict with its current late summer water quality. The average summer water quality, however, is consistent with its existing and desired future uses. Historical data suggests that conflicts during the late summer period occur annually and the degree of conflict is generally worse than was observed during 1993. As shown on Figure 4-8, the summer Secchi values during July through August have generally been within the eutrophic range during the past six years. 23\82\045\SEC4.RPT\KMH 21 DRAFT: June 23, 1994