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The hydraulic reanalyses for this reach of the South Platte River was completed in September 1987. 1.3 Coordination Community base map selection, topographic mapping, and the identification of streams requiring- detailed study were accomplished in a meeting attended by personnel of Gingery Associates, Inc., FEMA, the UDFCD, and officials of Commerce City on February 12, 1976. The final community coordination meeting was held on March 1, 1977, at which time the final results of the Flood Insurance Study were presented to city officials and residents. An explanation of the NFIP was made by a representative, of FEMA and the results of the Flood Insurance Study were presented by Gingery Associates, Inc. There were no problems with or objections to the study, 2.0 AREA STUDIED 2.1 Scope of Study This Flood Insurance Study covers the incorporated area of the City of Commerce City, Adams County, Colorado. The area of study is shown on the Vicinity Map (Figure 1). Floods caused by overflow of the S9uth Plat te River and Sand Creek were studied in detail. The areas studied in detail were chosen with consideration given to forecast~d development. 2.2 Community Description Commerce City is situated in the southwestern corner of Adams County, a centrally located county in Colorado. The city is 15 miles south of Brighton, the co,!nty seat, Denver's Stapleton International Airport and the U.S; Army's Rocky Mountain Arsenal border the city on the east. The C;ty and the County of Denver, the state capital, forms the southern bqundary, and Adams County adjoins the city to the north and west, . Commerce City was first incorporate:d in December of 1952 and named Commerce Town. The population increased 750 percent from 1,200 persons in 1952 to 9,000 persons in 1960 at which time Commerce Town became Commerce City. As of 1980, the City had a population of approximately 16,230 persons. In 1988, the population was estimated to be approximately 18,200 persons. 2