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1974) and Volume III presented data for the reach between Fort Collins and Greeley (October 1975). The hydrologic studies that served as the basis for these reports are referred to herein as the 1973 studies. . BASIN DESCRIPTION The Cache la Poudre River, a left-bank tributary to the South Platte River, has its source in the Rocky Mountains west of Fort Collins. From the Continental Divide, the Cache la Poudre River flows in a general northerly direction and then turns eastward flowing past Rustic and Poudre Park. Approximately 5 miles downstream from Poudre Park, the North Fork of the Cache La Poudre River joins the main stem of the Cache la Poudre River. The Cache la Poudre River drains an area of about 1,055 square miles at the U.S. Geological Survey (USGS) stream gaging stption located at the bluffline approximately 4 miles down- stream from this confluence. At the bluffline, the Cache la Poudre River leaves the mountains and flows in a southeasterly direction through the northern edge of Fort Collins and Greeley to its confluence with the South Platte River about 5 miles downstream from Greeley. Three miles upstream from the mouth of the Cache la Poudre River at the USGS stream gaging station, the river has a drainage area of about 1,877 squa. e miles. Elevations in the basin range from 4,600 feet to over 13,500 feet above mean sea level. EXISTING STRUCTURES Worster, Halligan, and Seaman are reservoirs that were studied in detail to account for their attenuating effect on flood peak dis- charges. Worster Reservoir, also known as Eaton Reservoir, is located in the upper North Fork Cache la Poudre River basin on Sheep Creek. The reservoir is used for irrigation. Halligan Reservoir, built on the North Fork Cache la Poudre River about eight miles northwest of Livermore, is used for the storage of irrigation water. Seaman 4 .