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EXECUTIVE SUMMARY This Floodplain Information Report (Report) regarding the Town of Holly (Town), Colorado, was prepared by Colorado Water Conservation Board (Board) staff in support of Floodplain Resolution Number 94-356.01. The Town of Holly occupies a position in the floodplain on the north bank of the Arkansas River in southeastern Colorado. Wild Horse Creek, a north bank tributary, and Two Butte Creek, a south bank tributary, join the Ark<msas River at Holly. The Town has suffered numerous floods from the Arkansas River and from Wild Horse Creek. A particularly devastating flood on the Arkansas River inundated Holly in June 1965, causing an estimated $1.5 millon in damage. Following the 1965 flood the Holly Flood Control, Drainage <md Sanitation District (District) requested help from the U.S. Almy Corps of Engineers (Corps). Subsequent Corps investigations resulted in a number of studies, reports, and actions. Two Special Flood Hazard Information Reports prepared by the Corps in 1974 and 1975 were the focus of Colorado Water Conservation Board action designating and approving, on February 26,1975, (Floodplain Resolution Index Number 40) and on May 12, 1976, (Floodplain Resolution Index Number 59) 100-year floodplain areas along the Arkansas River and floodplain areas in the vicinity of and including the Town of Holly. The U.S. Department of Housing and Urb:m Development (HUD) published on January 16,1976, an approximate floodplain map (Flood Hazard Boundary Map) for the Town of Holly. This map showed a major portion of the Town as being in the 100-year floodplain and subject to the risk of flooding. Following the Corps investigations and studies, the Holly Flood Control Project (Project) was constructed. Construction was completed October 3, 1980. The official completion date was February 13, 1981 when seeding was finished and inspected. The Project includes a levee, structures and interior drainage facilities. The Federal Emergency Management Agency (FEMA) acknowledged the Project's protection and took action, effective May 20, 1983, rescinding the 1976 HUD Flood Hazard Boundary Map and converting the Town to the Regular Program of the National Flood Insurance Program. This current Floodplain Information Report documents for the Colorado Water Conservation Board, the modified 100-year floodplain reflecting the benefits of the Project flood control structures, levees, and channel improvements near the Town. The Project excludes the 100-year flood from the portion of the Town fonnerly in the 100-year floodplain and now the entire corporate limits of the Town are out of the 100..year floodplain. A caution is raised that floods larger than the 100-year flood can occur on both Wild Horse Creek and the Arkansas River and the Town may be subject to risks from such floods. Recommendations are made to designate ,md approve the floodplain information in this Report and rescind portions of previous Board designations done prior to the Project.