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<br />The Apishapa and purgatoire Rivers are the two main <br />watercourses that flow through the county. In addition <br />to these rivers, there are six smaller tributaries <br />included in this study. They are Powell Arroyo, <br />Prospect Canyon, Raton Creek, Reilly Canyon Arroyo, <br />North Fork Purgatoire, and Middle Fork Purgatoire. <br /> <br />Those areas that are currently developed, or are <br />expected to be developed within the next five years, <br />were studied by detailed methods; the remaining areas <br />were studied by approximate methods. <br /> <br />The areas studied in detail include those reaches of <br />the purgatoire River between the Trinidad Lake project <br />boundary and the southern corporate limits of Trinidad, <br />and from the northerly corporate limits of Trinidad to <br />a point 3.8 miles downstream; Powell Arroyo, from its <br />confluence with the Purgatoire River to a point 2.7 <br />miles above the confluence; Reilly Canyon Arroyo, from <br />the Trinidad Lake project boundary to the northerly <br />corporate limits of Cokedale; and Raton Creek, from its <br />confluence with the Purgatoire River to the old U. S. <br />Highway 85 bridge south of Starkville, which is a <br />distance of 4.3 miles. <br /> <br />The areas studied using approximate methods include an <br />8.S-mile reach of the Apishapa River downstream of <br />Aguilar, a l4-mile reach of the Apishapa River upstream <br />of Aguilar, 3.8 miles of Raton Creek south of Starkville, <br />1.8 miles of the lower reach of North Fork Purgatoire, <br />7.8 miles of the lower reach of Middle F'ork Purgatoire, <br />17 miles of the Purgatoire River upstream from the <br />Trinidad Lake Project, 19 miles of the purgatoire River <br />from the detailed reach north of Trinidad to the <br />entrance of the Purgatoire Canyon, 0.8 mile of the <br />lower reach of Prospect Canyon Arroyo, and 0.4 mile of <br />Reilly Canyon Arroyo downstream from the Trinidad Lake <br />Project boundary. <br /> <br />On the Purgatoire River, about 3 miles upstream from <br />the City of Trinidad, the U. S. Army Corps of Engineers <br />is completing construction of the Trinidad Dam. The <br />primary purpose of the dam is flood control and recrea- <br />tion. The dam became operational for flood control <br />purposes in late fall of 1976; therefore, flood hazards <br />downstream are based on the dam's operation. <br /> <br />4 <br />