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<br />Del ta Gage No. 1495 <br /> <br />Colona Gage No. 1475 <br /> <br /> Peak Fl"" Peak Fl"" <br />Flood (Cubic Feet (Cubic Feet <br />Year per Second) Date per Second) <br />1921 1 June 13-14 51402 <br />1927 28801 June 29 3400 <br />1938 June 22 33901 <br />1941 3730 May 5 1 <br />1944 3340 May 16 1 <br />1947 35001 October 15 <br />1957 1 June 29 3300 <br />1975 July 4 3360 <br /> <br />Date <br /> <br />June 13-14 <br />June 28 <br />June 22 <br />May 5 <br />May 16 <br />October 15 <br />June 29 <br />July 4 <br /> <br />1 d' <br />2Flow Not Outs tan lng <br />Estimated Mean Daily Flow 4080 Cubic Feet per Second <br /> <br />Historic flooding in the Uncompahgre River valley described in <br />available news articles has damaged or destroyed railroad track <br />and embankments, road and railroad bridges, roads, diversion struc- <br />tures, and buildings and their contents a Inundation of agricultural <br />property has eroded farmland; damaged and destroyed crops and <br />irrigation systems; reduced soil productivity due to increased <br />salinity; and deposited sand, silt, and debris on cropland and <br />pasture. Railroad and highway traffic has been disrupted, public <br />utilities damaged and destroyed, homes evacuated for as long as <br />several days, and cattle moved to higher ground to protect them <br />from the possibility of drowning. <br /> <br />Photographs of flooding on Uncompahgre River in the vicinity of <br />Olathe are shown in Figures 2 through 4. <br /> <br />2.4 Flood Protection Measures <br /> <br />No flood control projects affecting floodflows or flood elevations <br />on Uncompahgre River at Olathe are in existence. However, the <br />Dallas Creek Project, located approximately 32 miles upstream <br />of Olathe at Ridgeway, ColoradO, is expected to help control flood- <br />ing problems. This project, as of June 1980, is approximately <br />5 percent completed, and can be expected to be operational in <br />March 1984. A reservoir, to be named Ridgeway Reservoir, will <br />be created that will have 80,000 acre-feet of storage, with addi- <br />tional flood control storage for spring runoff of 26,000 acre- <br />feet. A 1973 D,S. Army Corps of Engineers report states that <br />this project will reduce the Standard Project Flood of 7000 cubic <br />feet per second (cfs) to a flow of 3700 cfs at the damsite (Refer- <br />ence 5). Operation of the reservoir for conservation and storage <br />based on snowmelt forecasts would provide some flood control benefits <br />to downstream flood plain areas. <br /> <br />6 <br />