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Cherry Creek Cherry Creek was revised to reflect the effects of the recent urban developments and associated improvements. These improvements consist of the following: New bridges: Cottonwood Drive bridge Lincoln Avenue bridge E-470 bridgea Bridge replacements: West Parker Road bridge Stroh Avenue bridge Urban developments: Parker Station Subdivision Parker Water and Sanitation District treatment plant expansion Cherry Creek was reanalyzed from the Arapahoe/Douglas County line to a point approximately 2,100 feet above the Stroh Avenue bridge. The revised reach passes through both the Town of Parker and the unincorporated areas of Douglas County. The revised hydraulic analysis for this reach was based on a revision performed by CRB Engineering, Inc., Lakewood, Colorado, which utilized the COE HEC-2 step-backwater computer program. The study is presented in a technical report entitled "Request for Map Revision for Cherry Creek at Parker," dated April 1991 (Reference 40). As a result of this study the base (100-year) flood elevations (BFEs) both decreased and increased throughout the revised reach, and the 100- and 500-year floodplain and 100-year floodway boundaries were also revised. Topographic maps at a scale of 1"s400', with a contour interval of 4 feet, produced by the UDFCD and revised by Falcon Air Maps on May 18, 1990 (Reference 40), were utilized to produce the new boundaries as shown on the revised Flood Insurance Rate Map Panels 0070 D and 0185 D. These Flood Insurance Rate Map panels also show the new corporate limit boundaries for the Town of Parker, Colorado. Flood Profile Panels 52P through 61P and the Floodway Data and Summary of Discharges Tables have been revised to reflect the effects of the restudy. Sulohur Gulch Sulphur Gulch was revised to reflect the effects of the new State Highway 83 (Parker Road) bridge across Sulphur Gulch and overlot grading for property identified as Parker eentral Area C-12 property. As a result of these changes, the floodplain and floodway were redefined for a reach of Sulphur Gulch from Pikes Peak Road to a point approximately 1,200 feet downstream. The revised hydraulic analysis for this reach was developed by Greiner Engineering Sciences, Inc., Denver, Colorado, and presented in their technical report entitled "Sulphur Gulch Letter of Map Revision, Parker Central Area C-12, Parker, Colorado," dated August 1987. Profile Panels 86P and 87P and the Floodway Data Table for Sulphur Gulch have also been revised. 59