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<br />GREEN RIVER STUDY PLAN <br /> <br />11 <br /> <br />February 2,2007 <br /> <br />The geomorphology report focused on reaches and habitats used by life stages (larvae, <br />juveniles, subadults, adults, and spawning) of Colorado pikeminnow, humpback chub, and <br />razorback sucker, and identified the following primary information needs in the Green River <br />Subbasin for overall reach-habitat priorities and for species-specific reach-habitat priorities. <br /> <br />Reach-Habitat Priorities <br /> <br />1. "Connected backwaters and side channels (Split Mountain Canvon to Desolation Canvon <br />and Labvrinth and Stillwater Canvons) <br />· Role of peak flow (magnitude, duration, and frequency) and sediment on formation <br />and maintenance of habitats. <br />· Effects of antecedent conditions (flow and sediment) and base-jlow magnitude on <br />habitat availability. <br />· Effects of base-jlow variability on inter-annual availability, intra-annual stability, <br />and within-day stability. <br /> <br />2. Flooded bottomlands (Split Mountain Canvon to Desolation Canvon) <br />· Effects of peak flow (magnitude, duration, and frequency), sediment, and <br />configuration of connection to main channel on maintenance of connection and <br />sediment deposition effects. <br /> <br />3. Spawning bar complexes (Desolation and Grav Canvons) <br />· Effects of peak flow (magnitude, duration, frequency, and timing), base flow <br />(magnitude and duration), and sediment on habitat conditions during the spawning <br />period" <br /> <br />Species-SpecifIC Reach-Habitat Priorities <br /> <br />1. "Colorado Pikeminnow <br />a. Connected backwaters and side channels (Split Mountain Canyon to Desolation <br />Canyon, Gray Canyon to Labyrinth Canyon, Labyrinth and Stillwater Canyons) <br />· Same as those identified for Split Mountain Canyon to Desolation Canyon <br />reach under overall reach-habitat priorities above. <br />b. Spawning bar complexes (Desolation and Gray Canyons) <br />· Same as those identified for Desolation and Gray Canyons reach under <br />overall reach-habitat priorities above. <br /> <br />2. Humpback Chub <br />a. Spawning bar complexes (Desolation and Gray Canyons) <br />· Same as those identified for Desolation and Gray Canyons reach under <br />overall reach-habitat priorities above. <br />