1958 Map of Tyonek B-7

About this map

Mount Torbert and Mount Spurr anchor this high-altitude Alaskan landscape, where massive ice fields dominate the topography of the Tordrillo Mountains. The survey, field-checked in the late 1950s, reveals a complex network of moving ice, including the expansive North Twin Glacier and South Twin Glacier to the north. These glaciers feed the lower elevations where the Nagishlamina River begins its course through a distinct valley of vegetation. The map provides a remarkable record of glacial extent and features like the Barrier Glacier and Pothole Glacier before modern climactic shifts. This is a wilderness defined by ice and elevation, capturing the precise contours of summits and crevasses in an era when much of this land remained unsurveyed by traditional ground methods.