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seat when Moffat County was created by a division of Routt County in 1911. Sheep were introduced to the area approximately 1920, and oil production became important in 1924 when Moffat Field was opened. Coal production is the major economic base of the Craig area. Recent production of coal in the vicinity of Craig has created a boom town. The estimated 1979 population was approximately 12,000 (Reference 1), an increase of approximately 250 percent over the population of 1970 (Reference 2). This rate of increase is expected to continue because Craig is an energy-impacted community_ Fortification Creek has its headwaters in the Elkhead Mountains in Routt National Forest, approximately 20 miles north of Craig. Fortification Creek flows southerly from its origin near Black Mountain to its confluence with Yarnpa River, approximately 0.5 mile south of the southern corporate limits. The area drained by Fortification Creek at the downstream limit of study is approxi- mately 258 square mile~. The drainage basin of Fortification Creek drops from an elevation of 10,800 feet at its headwaters to 6,200 feet at Craig. The average slope through Craig is approxi- mately 11 feet per mile, or 0.21 percent. Brotherton Gulch has a drainage area of approximately 4.1 square miles. This basin enters the drainage basin for Fortification Creek from the west and begins at an elevation of 7,520 feet, approximately 4,2 miles northwest of Craig. It flows southeasterly, then easterly through the city to Fortification Creek near the northern corporate limits. Cedar Mountain Gulch has its headwaters in Cedar Mountain and is tributary to Pine Ridge Gulch. The drainage basin drops from an elevation of approximately 7,500 feet to 6,190 feet. Approximately 6.0 square miles are drained by Cedar Mountain Gulch at its confluence with Pine Ridge Gulch. The average stream slope is 3.4 percent. 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 7,000 feet to approximately 6,170 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. Tributaries 1 and 2 have their headwaters approximately 1.2 miles north of the eastern portion of Craig. Both tributaries drop from an elevation of approximately 6,620 feet at their headwaters to approximately 6,230 feet at the northern end of the study limit for Tributary 1 and to approximately 6,260 feet for Tributary 2. At the downstream study limit, Tributary 1 has a drainage area of approximately 0.7 square mile and Tributary 2 has a drainage area of approximately 0.3 square mile. 4