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Puehw Fwod HilZIl,d Mitit!tUion l"wn and through Pueblo. Many streams flow into the Arkansa:; upstream of Pueblo, all of which are fed primarily through snowmelt Pueblo Dam, on the Arkansas River, is part of the Fryingpan-Arkansas Pro] ect The dam was designed in the 1960s to handle a 100- year flood, and the construction was completed m 1975. Although it has the capacity to hold 357,000 acre feet of water, the Corps of Engmeers requires that the level not exceed 265,000 acre feet by April 15th until the end of the flood season, to provide sufficient capacity for snowmelt and spring rain. Also a part of Pueblo Dam's role in flood control IS an agreement that the flow at Pueblo Dam may be reduced so that by the time the wate,r reaches the Avondale gauge (east of Pueblo), the flow will not exceed 6,000 cubic feet per second- which could potentially flood downstream towns and agricultural areas. At this gage the water is not just coming from the dam but from all the previously mentioned tributaries of the Arkansas, so the dam can help reduce this cumulative flow. In review it is clear the Pueblo community is aware they must be as prepared as possible for the potential problem of flooding along ( "to s The Fryingpan-Arkansas Water Project, takl'D from Southern Colorado Water CODsernnc:y District ]993 An Dual Report. the many streams in the area. At the present time, there are many different kinds of miti- gation in place along these rivers. The Arkansas River underwent channel improve- ment and levee construction in 1922 following the 1921 flood. Then in 1975 the Pueblo Dam was completed, which helped flood control on the Arkansas River downstream as well as upstream of the dam. The Corps of Engineers authorized the Fountain Creek Flood Control Project in 1986 and by 1990 portions of Fountain Creek consisted of a levee system with a 200 year flood design composed of concrete, rip rap and/or a soil cement mixture. Pueblo also relies on the Satellite Stream Gauging Program under the administration of the Office of the State Engineer, as well as the Early Flood Warning System on Fountain Creek. Aside from natural waterways, Bessemer Ditch built concrete walls on portions of the ditch in 1980 and on other portions in 1990. The ditch runs from Pueblo Dam through the city and east to its owners, mostly farmers, on the St Charles Mesa. Some of these mitigative measures, including non-structural measures, will be discussed again later in this plan. FRYINGPAN-ARKANSAS WAnR PROJECT COLORADO BOUND:.<IES OF :,(,UTl-lE~N COLORADO WAfER C'ONS~RVA~C\ DISTRlc;'- .. '......~:o- -:::.......~J:!""'::;.?-~ ~-,.... ~ 6