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development on the east shore is minimal with large areas of open space. Large numbers of waterfowl and wildlife have been sighted on or near Lake DeMontreville, especially near this open space area. 4.2.7.2 Dram&1zePatterns and Stormwater Issues The water level of Lake DeMontreville is controlled by the Lake Olson outlet. The OHW of Lake DeMontreville is 930.0 (the same as Lake Olson). See the Lake Olson Water Management Plan section for a discussion about water levels and the outlet. 4.2.7.3 Water Quality and DNR Data The DNR currently manages Lake DeMontreville for largemouth bass, bluegill, and crappie. The lake's native fish population reproduced well in the past, and is currently reproducing well. For this reason, no stocking has occurred or is planned for the lake. Walleye have not been found in the lake, and the DNR has no plans to introduce walleye through stocking: The lake presently has. a high northern pike population, which makes walleye fingerling stocking unfeasible. Although fish are not stocked in the lake, the DNR periodically removes sunfish to stock other lakes. In 1986, the DNR began a 12-16 inch slot size limit on largemouth bass to control bluegill abundance in both Lakes DeMontreville and Olson. The slot size limit resulted in the development of a good largemouth bass population but did not improve the bluegill population. In the fall of 1993, the DNR decided to continue the slot size limit but shifted the emphasis from improving the bluegill population to maintaining a quality largemouth bass population. No winterkills have been reported since 1960. It appears that winterkills are more frequent when water levels drop to the range of Elevation 922 to 924. Lake DeMontreville was stocked repeatedly until 1975, mainly with northern pike. A 1979 survey found good spawning conditions for panfish and only fair .northern pike spawning conditions. A wetland area adjacent to the northwest shore was previously used by the DNR and local citizens as a cooperative rearing pond for northern pike. During rebuilding of DeMontreville Trail, the water level control structure for the spawning area was removed. As a result, the wetland area is no longer maintained by the DNR, but is used by fish for spawning, except in drought years. Water quality data have been collected from Lake DeMontreville on a regular basis since 1971, VBWD collected water quality data during 1971,1972, 1979, and 1990. The Metropolitan Council collected data during 1980, 1984 and 1991, and the Tri-Lakes Association collected samples in 1981. Citizen volunteers have collected Secchi disc transparency data from the lake each summer since 1971 as a part of the MPCA Citizen Lake Monitoring Program. The average summer total phosphorus, chlorophyll a, and Secchi disc transparency data are summarized in Figure 4-7. The lake has a stable thermocline throughout the summer, with thermal stratification noted at about 20 feet. In 1990, VBWD began collecting water quality samples from Lake DeMontreville once every three years. VBWD, in cooperation with the Metropolitan Council's citizen -assisted lake monitoring program, collected data from the lake in 1993. VBWD trained a volunteer to collect the samples. In subsequent years, data will be collected by VBWD every three years, using a volunteer whenever possible, However, Secchi disc data will continue to be collected on an annual basis by a volunteer as a part of the MPCA Citizen Lake Monitoring Program. In 1993, VBWD also trained a volunteer to collect samples from the stream which carries water from Grant Township to Lake DeMontreville. Stream samples were collected at various times during 23\82\045\SEC4.RPT\KMH 19 DRAFT: June 23, 1994