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2.0 Profile of Existing Water System <br />The following section includes information on the physical characteristics of the <br />water delivery system, as well as summarizing system conditions that may impact <br />water delivery. The City of Longmont (City) is committed to utilizing water <br />conservation as one approach to ensure future source water supply is adequate. A <br />summary of existing water conservation measures and programs is provided in <br />Section 4, Current Water Conservation Activities. <br />2.1 Water Sources <br />Raw water rights are received by the City from the St. Vrain Creek Basin and the <br />Colorado River Basin. St. Vrain Creek Basin includes the North St. Vrain Creek, <br />South St. Vrain Creek, St. Vrain Creek and Left Hand Creek, a tributary to St. Vrain <br />Creek. Headwaters of the North St. Vrain Creek are in Rocky Mountain National <br />Park with Ralph Price Reservoir as the primary water storage facility. Headwaters of <br />South St. Vrain Creek are near the Indian Peaks Wilderness Area. In 2005, 42 percent <br />of Longmont's water supply was from North St. Vrain Creek (2005 Water Quality <br />Report). The north and south forks combine to form the St. Vrain Creek near the <br />town of Lyons downstream of Ralph Price Reservoir. Water from St. Vrain Creek <br />can be diverted to Burch Lake (also called Oligarchy Reservoir No. 1) for storage. In <br />2005, 6 percent of Longmont's water supply was from St. Vrain Creek (2005 Water <br />Quality Report). <br />The City also has ownership in the Colorado -Big Thompson (CBT) and Windy Gap <br />trans- mountain diversion projects operated by the Northern Colorado Water <br />Conservancy District (NCWCD). Water from the Colorado River headwaters and the <br />Fraser River are stored in several reservoirs west of the continental divide. CBT <br />water is conveyed through the Alva S. Adams Tunnel to the east slope, and then <br />through several lakes and reservoirs to Carter Lake. From Carter Lake the City <br />receives CBT water through the St. Vrain Supply Canal and Southern Water Supply <br />Pipeline. In 2005, 52 percent of Longmont's water supply was from CBT water (2005 <br />Water Quality Report). <br />Storage reservoirs part of the City's water supply system includes the following: <br />• Ralph Price Reservoir <br />• Pleasant Valley Reservoir (also called Terry Lake) <br />• McCall Lake <br />• Oligarchy Reservoir No.1 (also called Burch Lake) <br />• Clover Basin Reservoir <br />• Union Reservoir <br />• Independent Reservoir <br />• Elliot Ponds 1, 2 and 3 (also called Golden Ponds) <br />