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Show Table 2. Water quality information from long- term USGS monitoring stations on the major inflow tributaries of Lake Powell. ( Taken from USGS, 1985.) USGS # Station Name Period of Record 1984 Water Quality Parameters 09180500 09315000 Colorado River near Cisco, UT Green River at Green River, UT 09379500 San Juan River near Bluff, UT DSX 1895- present WQ 1928- present DSX 1894- 1899 1904- present WQ 1928- present DSX 1914- present WQ 1929- present D, C, B, T, S D, C, B, T, S D, C, B, T, S LEGEND: DSX = Discharge WQ = Water quality D = Daily discharge C = Monthly water chemistry ( nutrients and metals quarterly) specific conductance PH turbidity dissolved oxygen hardness ( carbonate and non- carbonate) major cations ( Ca+, Na+, Mg+, K+) major anions ( alkalinity, CI-, so4-) total dissolved solids nutrients ( ammonia, nitrate and nitrite, organic nitrogen, total nitrogen, dissolved phosphorus, dissolved orthophosphorus, and total phosphorus) heavy metals and trace elements ( Al, As, Ba, Be, Cd, Cr, Co, Cu, Fe, Pb, Li, Mn, Mo, Hg, Ni, Se, Ag, Sr, V, Zn, B) B = Quarterly bacteriological data, including fecal coliform bacteria and fecal streptococcus bacteria T = Daily water temperature and specific conductance S = Suspended sediment ( daily) and particle size ( quarterly) 18 |