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surface flow and the streambed was hard-packed by cattle. Station 5 is located in a 90 foot pool created by the remains of a beaver , dam, The substrate is silt/clay and ,fig sp, and SclrDus ap, are common along the shoreline. A small stream (1 m [3 .3 ft]) the study area. Middle Creek's St valley, creating pools and riffles overhanging willows (~3~yg sp.). cobble and gravel with sand, and p boulders. Below Station 1, the cr less and it meanders widely throug • pool:riffle ratio is 60:40 and ail substrate. The filamentous algae, ' Station 3 is located in marshy bot is often braided because of beaver that the streamflow is nearly impe dominate the substrate composition with low gradient throughout stion 1 meanders through a narrow bordered by scattered Substrate consists of small stches of bedrock or medium eek's gradient becomes even h grazed pastureland. Its t layers the gravel/cobble St,irogjra sp. is common. tomland where the stream channel activity. Gradient is so slight rceptible. Sand and silt ' The water quality of Middle Creek may be typified by the temperature, pH, and electrical conductivity data for Middle Creek Station 3 for the period of March, 1979 through June, 1981 ... (Energy Fuels Corporation, 1981). Most summer temperatures ranged from 11 to 24 degrees C with considerable diurnal fluctuation. ~- The 1979 pH values ranged fron 7.8 to 8.4. During 1980-81, pH ranged from 6.8 to 8.2 but averaged approximately 7.3. Electrical conductivity typically approximated 600 micromhos per centimeter, but ranged from 260 to 2,560 micromhos per centimeter. Wider than the other study area streams (4 m (13 ft] or more) Fish Creek has a low gradient (0.28) and meanders widely. The streambanks lack woody riparian vegetation, and are not stable enough to permit undercut banks. Riffle habitat is rare; pools and runs are predominant. Sand and silt form the substrate throughout most of the streambed. Water quality characteristics for Fish Creek are available • from temperature, pH, and electrical conductivity measurements taken from March, 1979 through June, 1981 at Fish Creek Station 1 (Energy Fuels Corporation, 1981). Summer temperatures ranged from 15 to 25 degrees C. The water appears to be more alkaline during 1979 than 1960-81, as pH values for 1979 ranged from 7.9 to 8.5, while 1980-81 pH values ranged from 6.6 to 7.9. Electrical conductivity typically approximates 500 micromhos per centimeter • with a range of 240 to 650 micromhos per centimeter.