Laserfiche WebLink
<br />0:1488 <br /> <br />. <br /> <br />. <br /> <br />elevations along this part of the divide are 13,000 feet at the <br />western end, 8,000 feet in the vicinity of the headwaters of <br />Lorencito and Long Canyons, and 9,500 feet on Raton Mesa in the <br />headwaters of Raton Canyon, southwest of Trinidad. East of Trinidad <br />and north of the river is a rolling-plains srea. <br />b. HydroloRV. In downstream order, the major left <br /> <br />bank tributaries upstream from the damsite are Wet, Zarcillo, Burro, <br /> <br />and Reilly Canyons. The largest right bank tributaries are South <br />Fork, Lorencito, and Long Canyons. The mouths of Reilly and Long <br />Canyon will be within the conservation pool. Long Canyon, with a <br />drainage area of 109 square miles, is the largest tributsry above <br /> <br />the d~ site. The second largest tributary above the dam is the <br /> <br />South lork, which drains 101 ruggedly mountainous squsre mUes in <br />the southwestern portion of the upper basin. <br />The conformation of the upper Purgatoire River basin has develop- <br /> <br />ed a stream pattern in which the tributary drainage areas are <br /> <br />cOlllp4ratively small and the tributaries are relatively short. <br /> <br />From the confluence of the North and Middle Forks, the Purgatoire <br /> <br />River flows through a valley in a narrow mountainous section to <br /> <br />Trinidad. This valley varies in width from a few hundred feet to <br /> <br />about 1/4 mile. Between Trinidad and the mouth of San Francisco <br /> <br />Creek, the stream flows through an alluvial vslley which reaches <br /> <br /> <br />a maximum width of about 3/4 mile. In the hesdwater reaches up- <br /> <br /> <br />stream from Weston, gradients are several hundred feet per mile. <br /> <br /> <br />Below that point to the vicinity of Long Canyon, slopes are in <br />excess of 50 feet per mile. Between Long Canyon and San Francisco <br /> <br />11-3 <br />