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Figure 6 <br />Rio Grande Basin <br />Colorado <br />x <br />UU ~ E <br />a <br />Legend <br />Elevation Relie# <br />~ Lakes and Reservoirs <br />Rivers and Canals <br />Roads <br />UUater district Boundaries <br />10 <br />10 20 3G Miles <br />.~ ,~~ __ <br />~. <br />,d .,~. '~- ., <br />~°` f ~ <br />~# ~ fan L isalle~r ~ `~ <br />~ I ~,reat Sand dunes, '~ <br />-' -~~ at'I Monument <br />el H or?te ~I _ ' . <br />.~ .. ' i'A <br />.a~, ,. <br />r I~ ~ I~Alamosa4 ~'~ ~' } 1°~ <br />6 1 ~ ,F. ~" ~+Y <br />~-{~ k- m ~ <br />The Rio Grande main stem rises in the San Juan Mountains in the vicinity of Creede, <br />Colorado and flows easterly where it is j oined by the South Fork of the Rio Grande at <br />South Fork, Colorado. The main stem continues southeast to the San Luis Valley floor <br />until it reaches Alamosa, where it turns south and flows to the Colorado/New Mexico <br />State line. Major tributaries to the Rio Grande include the Conejos River, Saguache <br />Creek, Alamosa Creek, and La Jara Creek. Most stream flow originates from snowmelt in <br />the surrounding mountains. Average annual precipitation in the valley ranges from 7 <br />inches in Alamosa to 45 inches at Wolf Creek Pass. <br />The complex subsurface geology of the valley is generally comprised of a shallow <br />unconfined aquifer and a deeper confined aquifer. The aquifer system is in hydrologic <br />connection with the surface water system in many areas throughout the valley. <br />2.2 Support to other RGDSS Modeling Efforts <br />As part of estimating historic consumptive use, the following information was developed <br />and provided to other RGDSS Contractors to support their modeling efforts: <br />cureport_6-2004.doc 9 of 48 June, 2004 <br />