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. stratum within the study area (Stratum X) was originally delineated as the area between Rangely, Colorado, river mile (RM) 94.5 and the Ignacio Bridge, RM 59.3 in Utah (Miller et ale 1982a). For the purpose of our investigations, that portion of Stratum X within the study boundary (Utah-Colorado state line to the Ignacio Bridge) was designated Stratum X2. This 12.7-mi (20.4-km) section contains the most diverse habitat. The river flows through steep canyons, has a higher gradient than adjacent strata and has riffles with cObble/rubble and rubble/cobble substrate (Miller et ale 1982a). The middle Stratum (Y) begins at the Ignacio Bridge, RM 59.3 and ends 38 mi (61.1 km) downstream at the Mountain Fuel Bridge, RM 21.3. In this section, the river flows through more open canyons and has a substrate mixture of sand/silt where water velocities are low and cobble/rubble or rubble/boulder in high gradient, high velocity reaches (Miller et ale 1982a). The lowest Stratum (Z) begins at the Mountain Fuel Bridge, RM 21.3 and extends 21.3 mi (33.8 km) downstream to the confluence of the White with the Green River. In this stratum, the river flows through a wide flood plain and is characterized by lower gradient, lower velocities and smaller substrate than is found in upstream strata. . . . . . . . . . 5 .