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<br />" . . <br />""", .,- 0:';1011 ...,4 <br /> <br />ee <br /> <br />13. North and Middle Forks form the Purgatoire River at their <br /> <br /> <br />confluence, river mile 186. These streams have their sources in Sangre <br /> <br /> <br />de Cristo Range of the Rocky Mountains, or more definitely Culebra <br /> <br /> <br />Range, along the western boundary of the basin. From its source the <br />Purgatoire River traverses the central pdrtion of the upper basin in an <br />easterly direction. <br />lL. The conformation of the drainage basin has developed a stream <br />pattern in which the tributary drainage areas are comparative~ small, <br />and the tributaries are relatively short, Numerous tributaries enter <br />the river from the north and south, the more important ones from the <br />north in downstream order are Wet, Zarci1lo, Burro, and Reilly Canyons, <br />and Chicosa Creek; those from the south are South Fork, Lorencito, Long, <br />and Raton Canyons, and Frijole Creek. The upper basin and strea~ pat- <br />tern are shown on plate 1, appendix A. <br /> <br /> <br />15. Topography. - The drainage basin west of Trinidad, Colorado, <br /> <br /> <br />is rugged and mountainous. The relief varies almost 9,000 feet in <br /> <br /> <br />elevation from the source of PurgatOire River to its confluence with <br /> <br /> <br />San Francisco Creek. On the western boundary along Culebra Range, <br /> <br /> <br />Trinchera Peak ex~eeds lL,ooO feet i~ ,-lev~tion, while Purgatory and <br /> <br /> <br />Culebra Peaks, tiu t.o next highest, c,r3 elver 13,500 feet. The northern <br /> <br /> <br />drainage divide descends about 7,500 fest in eleva'tion, in a distance of <br />