Calder Reservoir is a small reservoir located on Pot Creek on Diamond Mountain. It is the second reservoir of three on Pot Creek, along with Matt Warner and Crouse reservoirs.
Update August 6, 2018
Division of Water Quality (DWQ) monitoring crews collected a sample at the Calder Reservoir Boat Ramp on July 26, 2018. Toxin test results from the Utah Department of Agriculture and Food (UDAF) lab showed <0.1 micrograms per liter (µg/L) of anatoxin-a and 3.95 µg/L of microcystin. This microcystin level is extremely close to the recreational health-based threshold of 4.0 µg/L.
DWQ anticipates cyanobacteria cell-count concentrations and taxa identification later in the week.