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<br />Bridalveil Creek also enters from the east side of the valley about 1,500 feet fUliher downstream. near the <br /> <br /> <br />center of the project. Both tributaries lave fans associated with deposition of coarse sediments and are <br /> <br /> <br />subject to mud and debris flows (Jochim, 1986). The current outlets of these creeks from their fans are shown <br /> <br /> <br />in Photos 2.7 and 2.8 for Skyrocket and Bridalveil Creeks. respectively. Both outlets are a considerable <br /> <br /> <br />distance from the Uncompah9re River, approximately 400 feet for Skyrocket Creek and 200 feet for Bridalveil <br /> <br /> <br />Creek. Although the fans have slop'~s of 15 to 20 percent. the channels between the fans and the <br /> <br /> <br />Uncompahgre are on the order of 2 percent. <br /> <br /> <br />Two other tributaries of interest to this study are f'ortland and Cascade Creeks. TIlese are the two <br /> <br /> <br />tributaries of the Uncompahgre Wllich cause the greatest mud and debris flow problems in Ouray Cascade <br /> <br /> <br />Creek enters the Uncompahgre approximately 2.000 feet upstream of the project from the east side of the <br /> <br /> <br />valley. Portland Creek joins the Uncompahgre fronl its east bank 4,000 feet upstream of the project. Both <br /> <br /> <br />Cascade and Portland Creeks are conve,yed through Ouray in concrete channels in order to reduce damages <br /> <br /> <br />from mud and debris flow events. Photo 2.9 shows ttle downstream portion of Cascade Creek which consists <br /> <br /> <br />of a debris basin and outlet to the Uncompahgre Rivelr. Photo 2..10 depicts the confluence of Portland Creek <br /> <br /> <br />with the Uncompahgre River. <br /> <br />2.3 Summary <br /> <br /> <br />Geomorphology and sediment transport are important considerations in design, development and <br /> <br /> <br />maintenance of the proposed Uncompahgre River Redevelopment Project. This is due to the apparently <br /> <br /> <br />braided unconfined channel currently in the project area and the potential for high sediment ioads from the <br /> <br /> <br />tributaries within the project immediately upstream. This chapter has given an overview of these situations; <br /> <br /> <br />the remainder of this report further describes these features and provides information and analyses utilized <br /> <br /> <br />to design the proposed project to function properiy wnder these conditions. <br /> <br />2.3 <br />