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Water Oualitv Analvsis Water samples were collected from most stations and analyzed- - for major metals, anions and cations. In addition, field measures. of pH, D0, conductance and temperature were taken routinely at our study sites. Waters in the Mi11 Creek drainage are classified. as 2B (protected for secondary contact recreation -such as boating, wading or similar uses) and 3A (protected-for -cold water species of-game fish and other cold water aquatic life' including the necessary aquatic organisms in their food chain)- according to State of Utah Water. Quality Standards-(Utah 1993). Table 5. .Ranges of physical variables .measured in the main. . wetland community types. Community MaxTT MinTB MaxDOt MinDOt MaxDOb Mii1DOb MaxAHt MaxpHb Bulrush 27-31 20-25 3.7-8.5 0.2-0.3 0-4 0 7.3-7.8 7.0- 7.5 Open Water 29-34 24-26 5.4-9.4 1.8-8.6 0.3-6.2 0-0.5 7.7-8.5 7.4- 7.8 River 22.9 18-22 8.3-8.6 7 - 7.5 8.7 _ Flooded W 9.3 0 5.5 7 8 7.5 MaxTT =Maximum temperature °C top of water column.` MinTB =Minimum .temperature °C bottom of water column. MaxDOt =Maximum, dissolved oxygen-at the-top of .the water column. MinDOt =Minimum .dissolved. oxygen at the top of the water.column.- MaxDOb =Maximum dissolved oxygen at the bottom of the water column. MinDOb =Minimum dissolved oxygen at the bottom of the water column..- - MaxpHt =Maximum pH at-the top of-the water column. MaxpHb =Maximum pH at the .bottom of the'-water column. Temperature. Water temperature was measured at sample stations each time invertebrates were sampled. As is summarized in Table 5, the bulrush, open water and willow stands-have higher maximum temperatures at the top and bottom of the water column than the river. Temperature differences between communities were apparent.. The bulrush and open water stands had higher maximum temperatures than the river both-at-the top and bottom of .the -water column. Dissolved Oxygen. Dissolved oxygen varied greatly between -sites.- The river had higher dissolved oxygen levels-than other wetlands during the entire sample period, as would. be expected. -The range of maximum DO recorded at the .top of the water column _ at open water stations-was higher than that recorded at bulrush 28