Thanks to QLIA Water Quality Program Leader Bryan Neuswanger and Teal Lake Water Quality Monitor Carol Jarzyna, Teal Lake is once again being monitored monthly during the summer season in order to document important water quality parameters. Carol (a new member of QLIA who recently moved to Teal Lake with her husband, Tom) and Bryan worked on Teal Lake on September 3 to determine water clarity, water temperature (from surface to bottom in the deep 30-foot hole), and dissolved oxygen concentration (also from surface to bottom in the deep hole). They also collected water samples and shipped them to the State Lab of Hygiene for analysis of total phosphorus concentration and chlorophyll a concentration (an index to the biomass of planktonic algae) in the uppermost 6 feet of the water column. Added to July data collected by Bryan, these samples will enable WDNR to determine whether or not Teal Lake can be removed from the list of “Impaired Waters” under Section 303(d) of the Federal Clean Water Act of 1972 during the next assessment cycle ending in 2020.
Besides the valuable measurement of water quality, these data can be of interest to anglers. How deep should we expect to find fish in this late-summer period? The Teal Lake data show that dissolved oxygen levels fall precipitously from 4.2 to only 1.0 milligram per liter between the depths of 21 feet and 24 feet. Therefore, until Teal Lake “turns over” and becomes the same temperature from top to bottom in late September, we would not expect to find many fish below a depth of about 22 feet. There’s just not enough dissolved oxygen down there to support normal fish activity. This is a normal summer condition for lakes with sufficient depth to permit thermal stratification in mid- to late-summer. But knowing these facts may help anglers to focus their attention, for the time being, on where the fish are (at depths less than 22 feet).
Click on the link below to see the water temperature and dissolved oxygen profiles provided by Bryan and Carol.