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11/18/98 1E!!!!!7 IS 6126461514 ItHIOuATIUE PR!NT p.et " ,: I \. \ 1.. ~ 9 November 17, 1998 Depth of Water of Langton Lake The depth of water of Langton Lake was detennined on October 20, 1998 from a canoe by Yul Yost and an assistant. The depth probe was a one gallon square.bottomed (6x6 inches) white milk container which was filled with water and some sand. The probe was suspended on a rope, which was marked at 2,4 and 6 feet.. The water depth was measured by lowering the gallon jug until the rope slackened and the depth was read. Twenty-eight measurements were made on the three sub-basins of the lake. The nOM sub-basin is about 2.5 feet. The middle section is at its deepest 4 feet as is the south sub. basin. The northwest comet of the latter, which has allegedly been deepened by Mr. Hebe in about 1955 to about 15 feet, is 40 feet from the shore only 4 feet deep. The nonh pool was untiJ 1996 completely oovered with the water lilies. That year DNR applied a herbicide and some 65 percent of the lilies were eliminated as detet'mined by visual inspection. The water lilies invaded the middle section in about 1991 and are spreading every year. Water lily pads were observed in four feet. deep water. It's notewonhy that the water ~f Langton Lake as detennined by the DNR in 1962 was only 6 feet. Then again in 1915it was found to be five feet, (see enclosed copies of those reports). Now in 1998 the deepest water is only 4 feet. The trend is obvious: from 6 to 4 feet in 36 years. Henceforth, the process will accelerate, because since 1988 the nutrient-ric;h stonn"5eWer water has been directed into the lake. Thus, besides accumulation of decaying plantst water.bom silt and leaves will promote the continued filling of Langton Lake. Respeafu11y yours, '/ d fhr- Yul YOst (Research Chemist, ret.)