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I I I I I I I I I I I I I I I I I I I II-2 Study segment lIB is characterized by the existing broad floodpl ain between Sheridan and Federal (averaging 1/2 mile in width), and a narrow (less than 600 feet) floodpl ain between Sheridan and Wads\\Orth. MJst of thf' floodpl ain from Federal to Sheridan north of 1-76, is a potential fill area. channel have not been approved by Adans County or the Urban Drainage and Flood Control District at the time this report was being prepared. There are nunerous existing and potential problem areas located in the floodpl ain within this study segment, incl uding: commercial and residential structures; five proposed and potential fill areas: the proposed 1-76 service roads serving floodplain lands; inadequate bridge crossing of the Denver and Rio Grande Western Ra il road; commerci al and industri al structures located within the floodplain at Federal Boulevard; and overtopping of Federal Boulevard and Pecos Street by more than 18 inches dur.ing the 100-year flood. Numerous problem areas located in the floodpl ain exist within study segment lIB, including: residential, commercial and industrial structures; t\\O mobile home parks (one located west of Tennyson Street, and the other west of Sheridan Boulevard); proposed and potential landfill sites; the proposed 1-76 service roads serving floOdplain lands; and overtopping of Lowell Boulevard, Tennyson Street and Wads\\Orth Boulevard by more than 18 inches, and Sheridan Boulevard by less than 18 inches during the 100-year flood. The construction of the 1-76 channel improvements will increase the 100-year flood discharge along the main channel south of 1-76 at the Tennyson St. and Lowell Blvd. bridge structures and will raise the 100-year water surface elevation above the existing 100-year flood level by approximately 1 foot immediately upstrean of Tennyson St. and approximately 3 feet immediately upstrean of Lowell Blvd unless improvements are provided at these t\\O crossings. STUDY REACH I (CONFLUENCE WITH THE PLATTE RIVER TO HURON STREET) STA 0+00 to 153+00 STUDY REACH IIA (HURON STREET TO 1,400 FEET UPSTREAM OF THE DENVER & RIO GRANDE WESTERN RAILROAD) STA 153+00 to 272+30 Study Reach I consists of a 2.9 mile segment of lower Clear Creek from the confl uence with the South Pl atte River, upstream to Huron Street, located entirely within Adans County. The Creek is situated between Colorado Highway 224 and Interstate 76 from the Pl atte confl uence to 1-25. The Creek is crossed by York, Washington, 1-25 and Broadway. Study Reach IIA consists of an approximate 2.3 mile segment of Clear Creek from Huron Street to 1,400 feet upstre<Yl1 of the Denver & Ri 0 Grande Western Railroad, located within Adans County. In this segment, the Creek is crossed by Pecos Street, the Colorado & Southern Railroad, Federal Boulevard, and the Denver and Ri 0 Grande Western Railroad. The area from the Pl atte confl uence to 1-25 is characteri zed by vacant flood- pl ain 1 ands from York Street to Broadway. The Adans County/Cl ear Creek trail system is constructed from the confl uence west to Broadway. A Browning- Ferris Industries 1 andfill is located on the south side of the Creek between Broadway and Huron Streets. The study area is characterized by a primarily vacant floodpl ain with nuner- ous potent i al fill areas, inadequate bridge structures, a broad shall ow floodplain (averaging almost 1/2 mile in width), and commercial/industrial structures at Federal Boulevard. The floodplain presently consists of old gravel quarry operations, with pressure to fill and "reclaim" the floodpl ain by the private 1 andowners. Brannan Sand and Gravel Company has pl ans for construction of a channel in conjunction with "reclaiming" part of the flood- plain from a point approximately 600 feet downstream of Federal Boulevard east to the Colorado and Southern Railroad bridge. Brannan's plans for the Floodplain problems in this segment include the overtopping of Colorado 224 at the Pl atte confl uence, and the overtopping of Broadway by less than 6 in- ches during the 100-year flood. Brannan Sand and Gravel Company has channel- i zed Cl ear Creek from York Street to 400 feet west of the confl uence wi th the Pl atte River. Until the existing earthen constriction downstream of the Brannan channel is removed, Colorado 224 will be overtopped during the 100 year flood.