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. STUDY ARFA . . This investigation was conducted on the Green River from Browns Park (river mile [RM] 265) through Dinosaur National Monument to the OUray National Wildlife Refuge (RM 131) (Figure 1). This 134-mile reach of river coptains two flatwat~r sections, OUray to Split Mountain Campground (RM 199) and qgtes'of Lodore (RM 244) to Browns Park; as well as t;hree whitewater areas~ Lodore Can~on (RM 245-225), Whirlpool Canyon (RM 225-208) and Split Mountain (RM 208- 199) . . The first phase of the project, which involved capturing and radiotagging the fish, was conducted from the Lodore Ranger Station (RM 243.7) to OUray (RM 131). During the second phase, aerial radiotracking was done over the entire study area. Additionally, aerial radiotracking was conducted on the Yampa River from its confluence with the Green, upstream to RM 12; the Duchesne River from its confluence with the Green River upstream to RM 2; and on the White River from its confluence with the Green upstream to RM 1. This additional aerial tracking was conducted early in the winter in attempts to locate fish that could not be found in the study area proper. . . ~ccesa t9 the river was from nine locations, including the Lodore Ranger Station (RM 243.7), Echo Park (RM 224.4), Rainbow Park (RM 207.7), Split Mountain Campground (RM 199.5), Park Service 'Bone Yard' (RM 195.2), Ashley Creek ((RM 178.5), Bonanza Bridge (RM 169.8), Horseshoe Bend (RM 159.3), OUray Wildlife Refuge (RM 135.4), and OUray Bridge (RM 128.4). The Lodore Ranger Station launch was used only once to gain access into the whitewater sections of the study area during the first phase of the project. The remaining eight launch sites were used at various times throughout the winter depending on locations of the radiotagged fish, river flows, and road conditions. . Gaining access to the Rainbow Park and Echo Park boat launches requi red travelling substantial distances over paved and dirt roads which are only partially maintained or unmaintained during the winter months. Roads into both locations were impassable during one sampling trip, in February, due to mud and excessive snow depths. . . . . 3 .