1958 Map of Tyonek C-6

About this map

Trimble Glacier dominates this high-altitude landscape, its massive ice flow fed by a North Branch and South Branch that carve through the surrounding peaks. In the late 1950s, the area remained a wilderness of ice and water, where the Trimble River emerged from the glacial terminus to flow northward. To the east, Hayes River and its tributary Coal Creek provide a distinct drainage system separated by the Hayes River Pass. The map serves as a primary record of glacial extent and alpine hydrology before modern climate shifts, particularly notable for the southern reach of the Triumvirate Glacier and the cold depths of Strandline Lake at the foot of the mountains. This 1958 survey captures the intricate patterns of crevasses and ice fields that defined travel and geography in this part of Alaska during the mid-century.