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Colorado River Reach 6-The uppermost reach sampled in the Colorado River, Reach 6 extends from the Loma boat launch downstream to the Colorado-Utah border. The reach is moderately high gradient (4.7 ft/mi) with mostly cobble or rubble substrate. The unique, deep-water habitat known as Black Rocks occurs within this reach. Reach 7-This reach extends from Hotel Bottom downstream to Hittle Bottom, about 13 river miles. Gradient is moderate (2.7 ft/mi) with a mixture of rubble-cobble and sand-silt substrates. The Dolores River enters the Colorado River at the upper end of this reach. Reach 8-The lowest reach in the Colorado River, Reach 8 extends from 3 miles upstream of the Highway 163 bridge near Moab to just upstream of the Potash boat launch. The reach is predominately low gradient (1 ft/mi) with mostly sand and silt substrates. No significant tributaries enter the river within this reach. Yampa River Reach 9-This 10-mile reach is the uppermost reach sampled in the Yampa River. The area is characterized by a broad floodplain lying between Duffy Mountain and Juniper Mountain canyons. The gradient is moderate to low (4 ft/mi), with gravel-cobble and sand-silt substrates present. No major tributaries enter the Yampa River within this reach, however several large backwaters are found in the area. Reach 10-This reach extends from Juniper Mountain Canyon downstream to Cross Mountain Canyon. Total sampling distance is 10 miles. The reach lies in a broad floodplain. Gradient is moderate to low (3 ft/mi), with gravel-cobble and sand-silt substrates present. No major tributaries enter the Yampa River within this reach, however several large backwaters are found in the area. Reach 11-The shortest reach sampled in the adult Colorado squawfish monitoring program, Reach 11 extends about 5 miles from the mouth of Cross Mountain Canyon downstream through Lily Park. The river gradient is low (2 ft/mi), with sand and silt substrates in the lower portion of the reach. However, the upper portion is considerably steeper (7 ft/mi) and extensive cobble and rubble areas occur there. The Little Snake River enters the Yampa within this reach. White River Reach 12-The uppermost sampling reach on the White River, Reach 12 extends from Kenney Reservoir downstream 10 miles to Rangely, Colorado. The river lies between a broad floodplain to the south and steep, shale cliffs to the north. Gradient is moderate to high (7.3 ft/mi), with cobble- gravel and sand-silt substrates. No major tributaries or significant backwaters are present within the reach. Reach 13-This reach is the lower 21 miles of the White River and runs from Mountain Fuel bridge downstream to the confluence with the Green River. The river flows through a wide flood plain and has relatively low gradient (2.5 ft/mi) with predominately sand substrate. 28