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?3. <br />Major areas of concern: <br />1. Gravel operation and stockpiling of gravel near or in <br />the stream channel. <br />2. Erosional and destabilization effects of the unmaintained <br />road which follows the left bank near station F. <br />3. Silt deposition and accumulation as a result of the rise <br />in base level at Redlands Diversion dam. <br />4. Difficulty of passage through the high gradient reach <br />above station G. <br />5. Isolation of reach by the diversion dam. <br />Water quality impacts: <br />None noted <br />Water quarni ty impacts: <br />Irrigation in upstream areas, proposed diversion dam near <br />Whitewater. <br />Land-use impacts: <br />None noted <br />Ruby Canyon Trend Zone <br />The Colorado River leaves the Grand Valley peneplain near Loma, Colo- <br />rado and enters Horsethief and Ruby Canyons, both characterized by steep <br />sandstone walls and generally tranquil, meandering river characteristics <br />(Table 5). A highly unique area, known as Black Rocks, has resulted from the <br />river's encounter with a bed-rock gneiss formation near the lower end of <br />Ruby Canyon. The resistant rock substrate has been eroded to great depths <br />within a very narrow channel here. Elsewhere in the two canyons, the river <br />flows in run:riffle and run:crossing sequences across predominately cobble <br />substrate. Boulder substrate is common from the entrance to Ruby Canyon <br />through the Black Rocks area. <br />Major positive habitat attributes: <br />1. Deep water habitat in the Black Rock area.