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-. f""~;l lb~:tt\ Water and Storage Needs Assessment SECWCD/Assessment Enterprise December 10, 1998 . miles in length and drains an area of 18,9 15 square miles of which 18,130 square miles are contributing drainage area. Above John Martin Dam, four principal tributaries enter the mainstream from the south. They are St. Charles, Huerfano, Apishapa, and Purgatoire Rivers. Tributaries entering from the north are Fountain River, Chico Creek, and Horse Creek. The state line is about 58 miles below John Martin Darn. Drainage area from John Martin to the state line is 6,485 square miles. Big Sandy Creek is the principal north side tributary. Tributaries from the south are Caddoa Creek, Mud Creek, Dry Creek, Willow Creek, Clay Creek, and Two Buttes Creek. A verage annual yield of native water in the Arkansas Basin is estimated to be approximately 875,000 acre-feet (af) (Montgomery Watson, 1997: Study for Farm Bureau). Imported water has averaged approximately 13 I ,500 af/yr (1986-1995) from nine transmountain diversions (see Section 2.1.2). Major storage reservoirs in the Basin above John Martin include (from upstream to downstream) Turquoise Lake, Twin Lakes, Clear Creek, and Pueblo in the upper Basin, and Lake Meredith, Lake Henry, Dye, Holbrook, Horse Creek, and Adobe in the lower Basin. The upper Basin reservoirs regulate native flows, as well as transmountain imports of water. Turquoise Lake, Twin Lakes, and Pueblo Reservoir are storage features in the Fry-Ark Project The lower Basin reservoirs regulate native flows and return flows, and several provide important exchange capabilities that enhance overall water supplies for entities in the SECWCD. 2.1.2 Imported Water Sources There are nine sources of imported water into the Arkansas Basin. All of these transmountain diversions are in the upper Basin and they include: Transmountain Diversion 1986-1995 A veral!e Delivervll) (af/yr) Water Annortioned to or Owned bv"': Fry-Ark Project (Boustead Tunnel) Ditch CompaniesIFountain VaHeyl Others 48,715 10,125 1,590 Colorado Springs Pueblo Hoosier Pass Tunnel Columbine Ditch m GEl Consultants, Inc. 2-2 97411\FinaU\TE;""T.A.WPD I I I I I I I I I - I I I I I I i I I