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Report on water quality in Three Mile Lake

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Title: Report on water quality in Three Mile Lake
Author: Water Resources Branch, Limnology & Toxicity Section, Ontario Ministry of the Environment
Abstract: Surveys were carried out in Three Mile Lake in 1972 to evaluate the present status of the water quality with respect to bacteria, algae and aquatic plant growths. Additionally, plant nutrient and dissolved oxygen concentrations in the surface and bottom waters were determined. Three Mile Lake is located in the District Municipality of Muskoka and lies within the Precambrian Shield. The surrounding topography is characterized by rolling to steep hills and shallow overburden comprised of loam and sand glacial till. Three Mile Lake was found to have good bacteriological water quality well within the Recreational Use Criteria. However, pollution inputs were detected at three inlets on the southern and eastern shores. The bacterial levels at these inlets exceeded the Ministry of the Environment (M.O.E.) Recreational Use Criteria and indicated a possible health hazard. Further investigations to determine the source of this pollution will be carried out by staff of the M.O.E.'s Recreational Lakes Program. Bacterial levels generally increased from May to August probably as a result of increased rainfall inducing runoff, and also, greater recreational use during the August survey. The chemical water quality was satisfactory and small amounts of suspended algae were present in the water despite relatively high total phosphorus and Kjeldahl nitrogen concentrations in the surface waters. Mid-summer oxygen levels in the bottom waters of Station 30, a mid-lake sampling location, were insufficient to maintain fish and fish-food organisms at those depths.
Date: 1972
Rights: Queen's Printer for Ontario, Crown Copyright, Non-Commercial Use Permitted
Rights Holder: Queen's Printer for Ontario

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