Ninemile Reservoir : limnological assessment of water quality

Nine Mile Reservoir has been identified as water quality limited due to low dissolved oxygen and excess phosphorus loading to the reservoir from the surrounding watershed. The State of Utah has designated the beneficial uses of the reservoir as secondary contact recreation (2B), cold water game fish and the associated food chain (3A), and agricultural water supply (4). The cold water game fish designated use (3A) was identified as not supported on the State of Utah’s 2006 303(d) list of impaired waters. However, analysis of current water quality in Nine Mile Reservoir and its tributaries indicates that the reservoir is meeting all designated beneficial uses. Since anthropogenic activities are not impairing water quality, Nine Mile Reservoir is recommended to be placed in Category 5B of the State of Utah's 303(d) list and requested for removal from the current listing of impaired waters.