1958 Map of Tyonek B-6

About this map

Mount Spurr dominates this 1950s survey, a period when the United States Geological Survey and the Bureau of Land Management were documenting the shifting ice and volcanic activity of the southern Alaska Range. The landscape is defined by massive ice flows, including the Triumvirate Glacier, Capps Glacier, and Dogshead Glacier, each marked by extensive systems of crevasses. A significant geological insight is found near the southwestern corner, where Crater Peak is identified alongside deposits of Volcanic Ash, signaling the active nature of the terrain. The border between the Matanuska-Susitna Borough and the Kenai Peninsula Borough bisects these glacial fields. To the northeast, the presence of Strandline Lake highlights the intersection of glacial melt and stationary water bodies in this uninhabited, high-elevation environment.