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TIie1'ueblo Floodway Levee Extension was completed in 1952. The levee extends the lower end of the 1O,OOO-foot long Pueblo Floodway on the Arkansas River in the city of Pueblo. The floodway is part of a major flood control improvement that was constructed by local interests between 1924-1925 after a disastrous flood in 1921. Rock Canyon Barrier Dam, a concrete gravity and earthfill retarding structure on the Arkansas River 6 miles upstream of Pueblo, was also constructed by local interests to regulate major floods on the Arkansas River to the capacity of the floodway. Barrier Dam was later engulfed by the larger Pueblo Dam project completed by the Bureau of Reclamation in 1975 at the same site. The Pueblo floodway is a concrete trapezoidal channel with a capacity of about 110,000 cubic feet per second (c.f.s.). The purpose of the levee extension is to prevent inundation of an urban area of important industrial and transportation facilities by backwater from floods on the Arkansas River. The Fountain Creek Levees and Channelization project was completed in July 1989 and consists of two levees and channel excavation work. The west levee begins just upstream of the 8" Street bridge and extends 600 feet downstream. A concrete floodwall extends upstream from west levee another 787 feet. The east levee is comprised of both earth and soil cement sections. The east levee begins approximately 1,500 feet upstream of the 8" Street bridge past 13" Street and extends 8,316 feet downstream to the Missouri Pacific Railroad bridge, just past an existing grade control structure. A recreational trail extends another 1,200 feet downstream past a recreational area built within the east floodplain. The trail ends with a pedestrian bridge traversing over Fountain Creek to the west overbank. Channel excavation work was conducted primarily along the west river channel over a distance of 10,500 feet to obtain sufficient flow capacity to pass the 200-year flood. The Corps of Engineers completed Pinon Canyon Dam in 1954. The dam protects a highly developed urban area of about 40 acres in the northwestern and central sections of Trinidad from floods that originate in the watershed of Pinon Canyon Arroyo. The arroyo has a drainage area of about 1.4 square miles. Pinon Canyon Dam is an earth dam with a reservoir storage capacity of 406 acre-feet. In February 1977, the Corps completed the large multiple purpose Trinidad Reservoir project on the Purgatoire River, about four miles upstream from the city of Trinidad. Trinidad Reservoir provides a high degree of protection to the city of Trinidad and the agricultural areas above and below the city. The project also regulates the available water supply for more effective agricultural use. A permanent pool is also maintained for fish, wildlife and recreation. The dam is a 200- foot high earthfill structure with a crest length of 6,61 0 feet. The capacity of the reservoir is 114,500 acre-feet, with 51,000 acre-feet allocated to flood control, 20,000 acre-feet to irrigation, 4,500 acre-feet for the permanent fishery pool, and 39,000 acre-feet for sediment retention. The project can regulate flood discharges of 125,000 c.f.s. down 14,500 c.f.s.; the safe channel capacity through the city of Trinidad. However, the dam does not significantly affect the flood peaks at the mouth of the Purgatoire River downstream of Las Animas. Post Flood Assessment Report Chapter 2 - History of Flooding and Flood Protection 10 Draft Revised 09/09/99