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Sand Gulch has its headwaters in Cedar Mountain and is tributary to Fortification Creek. The areas drained at the upstream limit of detailed study and at the mouth are 9.7 and 14.8 miles, respec- tively. The drainage basin for Sand Gulch drops frt~ an elevation of approximately 7520 feet to 6250 feet at the downstream limit of study. The average slope of the stream is 2.8 percent, with an approximate slope of 0.7 percent through the study area. Sand Gulch Tributary has its headwaters in Cedar Mountain and drains an area of approximately 4.4 square miles at its mouth, and 4.2 square miles at its upstream limit of detailed study. The drainage area drops from an elevation of 6750 feet to approx- imately 6300 feet where it joins Sand Gulch. This stream has an average slope of 2.1 percent along its entire length with an average slope of 0.9 percent through the study area. Brotherton Gulch has a drainage area of approximately 3.8 square miles at its downstream limit of study (Craig corporate limits). This basin enters the drainage basin of Fortification Creek from the west and begins at an elevation of 7520 feet, approximately 4.2 miles northwest of Craig. It flows southeasterly, then easterly through Craig to Fortification Creek near the northern corporate limits. The average slope of the stream is 5.7 percent, with a slope of only 1.0 percent through the study area. Cedar Mountain Gulch has its headwaters in Cedar Mountain and is tributary to Pine Ridge Gulch. The drainage basin drops from an elevaton of approximately 7500 feet to 6190 feet. Approximately 6.0 square miles are drained by Cedar Mountain Gulch at its con- fluence with Pine Ridge Gulch. The average stream slope is 3.4 percent, with a slope of 1.0 percent through the study area. Pine Ridge Gulch has its headwaters in Pine Ridge and is a tributary to Yampa River. The drainage basin drops from an elevation of approximately 7000 feet to approximately 6170 feet. Approximately 16 square miles are drained by Pine Ridge Gulch at its confluence with Yampa River. The average slope of the stream is 2.4 percent with a 0.6 percent slope through the study area. Lay Creek has its headwaters in the mountains northeast of the City of Lay, Colorado, and is tributary to Yarnpa River. The water- shed areas at the upstream and downstream limits of detailed study are 93 square miles and 196 square miles, respectively. The average slope of the stream from the downstream limit of study to its headwaters is approximately 1.0 percent, with an average slope through the study area of 0.5 percent. The drainage basin for Lay Creek drops from an elevation of approximately 7200 feet at its headwaters to approximately 6130 feet at the downstream limit of study. Big Gulch has its headwaters in the mountains northeast of Lay and drains an area of approximately 103 square miles at its mouth 5