2017 Map of Petersburg C-1 SE

About this map

Tongass National Forest dominates this Alaskan landscape, where glacial activity and drainage patterns define the high-altitude terrain. The presence of the Nelson Glacier in the southeast corner provides a clear indication of the active ice-shaping processes still influencing the region's topography. Two distinct geological depressions, Horseshoe Basin and Groundhog Basin, sit at high elevations, serving as collection points for the seasonal runoff that feeds the complex network of surrounding creeks. A system of fork-fed waterways, including the S Fork Andrew Cr and the N Fork Porterfield Cr, radiates from the central peaks like Mt Waters. This map illustrates the transition from permanent ice fields to the deep-cut creek valleys that characterize the southeastern Alaska wilderness during the early twenty-first century.