Fact sheet describing the lake and its watershed; data collection and analysis; hydrology; phosphorus loading and lake water quality. Park Lake is a eutrophic lake with perceived water-quality problems that are due primarily to large inputs of phosphorus from its watershed. The major source of phosphorus in the lake is the Fox River. Large quantities of phosphorus are delivered to and pass through the lake during relatively short periods of overland runoff, but phosphorus loads delivered during periods of low flow are sufficient to cause eutrophic conditions and poor water quality as measured by trophic state index and Lillie and Mason's water quality index.

Hydrologic budget will be evaluated on watershed delineation on a topographic map; collection of evaporation and precipitation data; computation of lake stage and storage through use of recording guage and bathymetric map. Phosphorus budget will bedeveloped by: collection of approximately 60 samples from Fox River inflow to be analyzed for phosphorus concentration; monitoring of in-lake water-column phosphorus at two sites as described in part II, #2 of project proposal in application; estimationof internal phosphorus loading from bottom sediments; monthly sampling of phosphorus concentration in lake outflow. Quantification of lake water chemistry by periodic sample collection and depth profiles; data collected will be reported to DNR andpublished in USGS annual report. Information will be disseminated to the public through public meetings, newsletter mailings and local media.

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