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~ COUNTY FORMAT MAP SERIES PROJECT DESCRIPTION PURPOSE The new State of Colorado County Format Map Series at l:SO,OOO-Scale, herein- after referred to as County Maps, is designed to provide comprehensive coverage of the State with up-to-date, accurate, general-purpose, standardized topographic maps having a uniform medium scale. SCALE The scale of the County Maps is 1:50,000 which is at once larger than that of the U.S. Geological Survey (USGS) 1:62,SOO-scale, IS-minute format topographic quadrangle maps and smaller than the USGS 1:24,000-scale, 7.S-minute format topo- graphic quadrangle maps. 1:50,000 can be considered to be a medium scale. FORMAT The format of the County Maps varies with the configuration of the specific county. County boundaries generally delimit the map neat lines; however, in the final analysis the format will depend upon the size and shape of the county and the number of sheets required to map the county. With respect to the latter, the number of map sheets will range from a maximum of seven (Las Animas County; area 4,798 square miles) to a minimum of one (City and County of Denver; area 118 square miles). A sheet line index showing the neat lines, the mapped area per sheet and the sheet number is attached. INFORMATION CONTENT The information content of the County Maps generally exceeds that of the USGS 1:62,SOO-scale, IS-minute series and approximates that of the USGS 1:24,000-scale" 7.5 minute series. In order to allow for the compression of information attribut-- able to the 1:50,000 scale, it has been necessary to enlarge the contour interval of the County Maps as compared to the USGS 1:24,000-scale maps. For example, in a given area the former might have an 80-foot contour interval, while the latter might have a 40-foot contour interval. A facsimile of the Gilpin County Map is attached; however, this monocolor facsimile of the multicolor County Map has been reduced to 1:100,000 for the sake of distribution economy. PRODUCTION The original schedule calls for the production of County Maps of approximately twenty-five percent of the state's 104,247 square miles each year over a four- year period beginning in 1974 and terminating in 1978. County Maps are produced by the Rocky Mountain Mapping Center, Topographic Division, Geological Survey, U.S. Department of the Interior (USGS), located at the Federal Center, Lakewood, Colorado. County Maps are generally constructed on the basis of USGS 1:24,000- scale topographic quadrangle maps, or in limited circumstances, on the basis of USGS 1:62,SOO-scale topographic quadrangle maps.