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. . 1.3 Authorization and Financing This Flood Insurance Study was conducted by Black & Veatch Consul- ting Engineers, at the request of the Federal Insurance Administration, U.S. Department of Housing and Urban Deveiopment. The source of authority for the study is the Nationai Flood Insurance Act of 1968, as amended. Authority and financing is contained in Contract No. H- 3834 between the contractor and the Federal Insurance Administration. 2.0 AREA STUDIED 2.1 Scope of Study This Flood Insurance Study covers the unincorporated areas within Clear Creek County, Colorado. The vicinity maps (Figures I & IA) give the general location on Clear Creek County relative to other cities in the area and the topographic features within the County itself. Clear Creek County is located on the eastern slope of the Rocky Mountains in north central Colorado. The County is drained by Clear Creek, its tributaries and the upper reaches of Bear Creek. Portions of Clear Creek, the West Fork of Clear Creek, Fal I River, Mi I I Creek, Chicago Creek, Beaver Brook and Quayle Creek were studied in detai I whi Ie portions of Bear Creek, Witter Gulch, Yankee Creek, Clear Creek, the West Fork of Clear Creek, and Bard Creek were studied by the approximate method as agreed between Black & Veatch, the Federal Insurance Administration, and Clear Creek County. The areas stud i ed were chosen with cons i derat i on given to fore- casted development and proposed construction for the next five years (through June 1981). 2.2 County Description Clear Creek County encompasses some 394 square mi les of mountainous terrain located about 20 mi les west of the Denver Metropolitan Area. The County boundary on the west coincides for 37 mi les with the Continental Divide. In 1970, the population of Clear Creek County was 4,780 (Reference 3). A steady growth is expected for the County in the foreseeable future. Clear Creek drains about 285 square mi les, Bear .Creek 86 square mi les, and the North Fork of the South Platte River about 23 square mi les of the mountainous watershed in Ciear Creek County. Watershed elevations range from 14,270 feet atop Gray's Peak at the Continental Divide to about 6,900 feet at the eastern boundary of the County. 5