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NM Form 10i00+ OM Apor"Na 1OKW18 <br /> W" <br /> United States Department of the Interior <br /> National Park Service <br /> National Register of Historic Places <br /> Continuation Sheet <br /> Section number 7 Page 4 <br /> observations, maps, and photographs from the Colorado Historical Society <br /> Library and the Western History Department of the Denver Public Library. <br /> The final survey forms contain location by block, lot and address, <br /> construction date, historic and current use, condition, alterations that <br /> might affect integrity, a drawing of the outside dimensions of each <br /> building, an architectural description, a statement of significance when the <br /> history of a specific building, structure or site is known, and a current <br /> photograph. A determination of whether or not a building, structure, or <br /> site is contributing to the district was made from this information. The <br /> historic resources of the NHL district were determined to be contributing if <br /> they were constructed within the period of national historic significance <br /> from 1859-1918 and if they retained their historic structural and <br /> architectural integrity. Those buildings and structures classified as <br /> "ruins" that do not possess a sufficient degree of their historic integrity <br /> to retain their historic association were classified as non-contributing. <br /> Likewise, buildings from the historic period so substantially altered that <br /> their original architectural integrity is seriously damaged or destroyed are <br /> not considered contributing. <br /> Assignment of Log Numbers and Site Maps <br /> A log number, such as, C12-5, is assigned to each building, structure or <br /> site and gives three pieces of information about the property. It indicates <br /> town, block number, and location within the block relative to the other <br /> contributing properties. The letter "C" denotes Central City, "B" Black <br /> Hawk, and "N" Nevadaville. The block number for properties in Central City <br /> and Black Hawk was determined from the official town plat for each <br /> community. In those cases where the property is not located within the <br /> official town plat no block number could be assigned so a letter or letters <br /> were assigned which relate the property to its geographical location. The <br /> letters assigned for properties in Central City and their location were: <br /> EG-Eureka Gulch; N=Negro Hill; G=Gunnel Hill; B= Bates Hill; and P=Prosser <br /> Gulch. In Black Hawk the letters utilized were: CG=Chase Gulch; <br /> GR=Gregory Street; and CH=Central Hill. Nevadaville properties are not <br /> listed by blocks. As there are so few buildings remaining these are <br /> numbered according to a historic site map of the town. The third element of <br /> the log number indicates the sequence of the property within the block. The <br /> contributing elements are assigned a sequential number beginning with the <br /> property located on lot one or the lowest lot number with a contributing <br /> structure. For example C1-8 is Central City, Block 1, the eighth <br />