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Information Report, North Clear Creek, Gregory Gulch, Chase Gulch, Black Hawk, Colorado (Reference 1). 1.3 Coordination As a result of correspondence between the regional office of FEMA, the Colorado Water Conservation Board, and the City of Black Hawk, it was requested that a Flood Insurance Study for Black Hawk be prepared. The final community coordination meeting was held on December 5, 1983, and was attended by representatives of FEMA, the Colorado Water Conservation Board, and the City of Black Hawk. As a result of that meeting, additional areas of flooding, studied by approximate methods, were added to the maps (Reference 2). 2.0 AREA STUDIED 2.1 Scope of Study This Flood Insurance Study covers the incorporated areas of the City of Black Hawk, Gilpin County, Colorado. The area of study is shown on the Vicinity Map (Figure 1). North Clear Creek, Gregory Gulch, and Chase Gulch were studied by detailed methods. The areas studied by detailed methods were selected based on the extent and validity of available hydrologic and hydraulic data. Portions of North Clear Creek, Chase Gulch, Gregory Gulch, and their tributaries; Silver Gulch; and Fourmile Creek were studied by approximate methods. Approximate analyses were used to study those areas having a low development potential or minimal flood hazards. The scope and methods of study were proposed to, and agreed upon by, FEMA and the City of Black Hawk. 2.2 Community Description The City of Black Hawk is located in southeastern Gilpin County, in central Colorado. Black Hawk is located approximately 25 miles west of Denver and approximately 30 miles south of Boulder. The City of Central City borders Black Hawk to the west, and unincorpo- rated areas of Gilpin County border Black Hawk on the north, south, and east. The population in Black Hawk was 232 in 1980, an increase in popula- tion of approximately 9 precent since 1970 (Reference 3). Most 2