University of Washington Tacoma (UWT) staff (Dr. Jim Gawel and undergraduate Christopher Wu) were hired to collect additional water quality data for Lake Kapowsin over a five-month period from June-October 2016. Lake Kapowsin was recently designated Washington’s first freshwater aquatic reserve, and Washington Department of Natural Resources (DNR) staff requested additional summertime water quality data for use in informing lake and watershed management decisions. UWT’s findings are summarized in this final data report.