This data depicts infrastructure locations in Alaska as digitized primarily from 1:24,000, 1:63,360, and 1:250,000 USGS quadrangles. The source document that represented the newest information and best geographic location was used to capture the data. All infrastructure from the primary source document was digitized and then supplemented with the information from other source documents for additional or updated infrastructure or attributes. In addition, ISER added major rivers (those being named in the Anadromous streams catalog and > 150 km in length) and the historic Iditarod Trails for additional reference.
