Round Meadow Lake : Round Meadow Lake in Hidden Lake Forest Preserve in DuPage County, IL

This lake is still nearly entirely frozen, but there was some free water around the edges. The Cl test result was very low, perhaps because of this. I had to estimate the ppm because the units were too low for the card. I had an almost entirely frozen situation one time last year, and it also had quite low Cl, although not as low as this time. The consistent no-ice reading has been about 4 units, and this time it was about .8 units. The previous icy time it was 2 units.