Laserfiche WebLink
<br />Reach II The reach from RK 9.5 to RK 5 is less confined and gradient is 1 <br />m/km. The major substrate materials are cobble, gravel, and sand probably input <br />from local ephemeral tributaries. Cobble debris fans at tributaries form eddy <br />habitat at higher flows. These eddies become refugia pools for fish at base-flow. <br />Habitat in this reach is diverse at all flow levels. Several vegetated islands <br />increase habitat diversity by providing velocity breaks at higher flows and <br />side-channel backwaters at lower flows. At extremely low base-flow, pools <br />provide refugia for all sizes of fish. Colorado pikeminnow and humpback chub <br />adults were captured in this reach in 1988 and 1995 (Wick et al. 1991; Hawkins <br />et al. 2001). <br /> <br />Reach I The final reach is 5 km long from the confluence with the Yampa <br />River and is greatly influenced by Yampa River stage height. Flow is uninterrupted <br />through the unconfined channel and the reach contains very little fish habitat at <br />higher flows. As discharge recedes, backwaters are formed at islands and provide <br />habitat for smaller fish but the reach becomes a barrier for fish movement at <br />extremely low discharge because of the unconfined, wide, sand bed. During <br />runoff, Colorado pikeminnow and humpback chub adults must move through this <br />area on their way to Reach " (Wick et al. 1991; Hawkins et al. 2001). The <br />confluence of the Little Snake River to the Yampa River is located 80.8 km <br />upstream from the Green River. <br /> <br />8 <br />