1958 Map of Tyonek B-7

About this map

Mount Spurr and Mount Torbert anchor this high-altitude landscape within the Kenai Peninsula and Matanuska-Susitna Boroughs. The 1958 survey documents a region dominated by massive ice fields and active glacial movement, with the North Twin Glacier and South Twin Glacier defining the northwestern sector. The topography is characterized by vast systems of crevasses that mark the surfaces of the Harpoon Glacier and Pothole Glacier. In the south, the Nagishlamina River cuts through the glacial outwash, while the Barrier Glacier creates a formidable wall of ice. This map captures a pristine glaciated environment in the mid-20th century, showing the intricate relationship between high mountain peaks and the river systems they feed.