 The level of total dissolved solids in Briar Creek near its source has a range of 50 to 161 parts per million (ppm) and a median of 96 ppm. Upstream of West Branch Briar Creek, the range is 12 to 98 ppm and the median is 38 ppm. Near Briar Creek's source, the median is 14 ppm, the minimum is 10 ppm, and the maximum is 89 ppm. The concentration of dissolved solids in the upper reaches of East Branch Briar Creek ranges from parts per 25 to 113 ppm, with a median of 35.5 ppm. Immediately upstream of Briar Creek Reservoir, the concentration ranges from parts per 34 to 86 ppm, with a median of 43.5 ppm.
