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. DRAF1& 2.0 S'lUDY ARFA . This investigation was conducted on the Green River in the states of Utah and Colorado. It extended from Browns Park (RM 385; river mile or distance from the confluence of the Green and Colorado Rivers) through Dinosaur National Monument to OUray (RM 248) (Figure 1). This 137-mile reach of river contains three flatwater sections; Browns Park to Gates of Lodore (RM 385-365), Island and Rainbow Parks (RM 334-327), and Split Mountain to OUray (RM 320-248). It also contains three whitewater sections; Lodore Canyon (RM 365-345), Whirlpool Canyon (RM 343-334) and Split Mountain (RM 327-320). . . The study area was divided into three regions to stratify the area for sampling. The upper region extended from Echo Park (RM 345) downstream to Split Mountain (RM 319), the middle region is from Split Mountain downstream to Jensen (RM 302), and the lower region from Jensen downstream to Ouray (248). . Access to the river was from eleven boat launches, including the Lodore Ranger Station (RM 364.5), Echo Park (RM 344.2), Ruple Ranch (332.7), Rainbow Park (RM 327.5), Split Mountain Campground (RM 319.3), Park Service 'Bone Yard' (RM .315.0), Ashley Creek ((RM 298.3), Bonanza Bridge (RM 289.6), Horseshoe Bend (RM 279.1), OUray Wildlife Refuge (RM 255.2), and OUray Bridge (RM 248.2). The Lodore Ranger Station launch was used only once to gain access into the whitewater section of Lodore Canyon. After electrofishing efforts in October 1986 yielded no squawfish or razorbacks upstream of Echo Park, Lodore Canyon was abandoned as part of the study area, except for aerial tracking. Also, following year 1, Echo Park was also abandoned as part of the study area, because of road access problems in late winter and early spring. . . . . . 3 .