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<br />Draft Water and Storage Needs Assessment <br />SECWCDI Assessment Enterprise <br />December 10, 1998 . <br /> <br />miles in length and drains an area of 18,915 square miles of which 18,130 square miles are <br />contributing drainage area. Above John Martin Dam, four principal tributaries 'enter the <br />mainstream from the south, They are St. Charles, Huerfano, Apishapa, and Purgatoire Rivers. <br />Tributaries entering from the north are Fountain River, Chico Creek, and Horse Creek. The state <br />line is about 58 miles below John Martin Dam. Drainage area from John Martin to the state line <br />is 6,485 square miles. Big Sandy Creek is the principal north side tributary. Tributaries from <br />the south are Caddoa Creek, Mud Creek, Dry Creek, Willow Creek, Clay Creek, and Two Buttes <br />Creek. <br /> <br />Average annual yield of native water in the Arkansas Basin is estimated to be approximately <br />875,000 acre-feet (at) (Montgomery Watson, 1997: Study for Farm Bureau). Imported water has <br />averaged approximately 131,500 af/yr (1986-1995) from nine transmountain diversions (see <br />Section 2.1.2). <br /> <br />Major storage reservoirs in the Basin above John Martin include (from upstream to downstream) <br />Turquoise Lake, Twiri Lakes, Clear Creek, and Pueblo in the upper Basin, and Lake Meredith, <br />Lake Henry, Dye, Holbrook, Horse Creek, and Adobe in the lower Basin. The upper Basin <br />reservoirs regulate native flows, as well as transmountain imports of water. Turquoise Lake, <br />Twin Lakes, and Pueblo Reservoir are storage features in the Fry-Ark Project. The lower Basin <br />reservoirs regulate native flows and return flows, and several provide important exchange. <br />capabilities that enhance overall water supplies for entities in the SECWCD: <br /> <br />2.1.2 Imported Water Sources <br /> <br />There are nine sources of imported water into the Arkansas Basin. All of these transmountain <br />diversions are in the upper Basin and they include: <br /> <br />Transmountain Diversion <br /> <br />1986-1995 <br />A vera2e Delivervl') <br />(af/yr) <br /> <br />Water ADDortioned to <br />or Owned bv(l): . <br /> <br />Columbine Ditch <br /> <br />48,715 <br />10,125 <br />1,590 <br /> <br />Ditch CompaniesiFountain Valleyl <br />Others <br /> <br />Fry-Ark Project <br />(Boustead Tunnel) <br /> <br />Hoosier Pass Tunnel <br /> <br />Colorado Springs <br />Pueblo <br /> <br />lim GEl Consultants, Inc. <br /> <br />2-2 <br /> <br />91411\FinaU\TEXT-A.WPD <br />