1989 Map of Grassy Lake Reservoir

About this map

Pitchstone Plateau dominates the northern terrain of this Teton County survey, where volcanic geology and high-altitude water systems define the landscape. This 1980s record captures a sensitive interface where Yellowstone National Park meets the Targhee National Forest, and the John D Rockefeller Jr Memorial Parkway. The hydrological network is centered on the Grassy Lake Reservoir and the Falls River, which is fed by numerous tributaries including Ash Creek and Proposition Creek. Remote settlements such as Terraced Falls and Cascade Acres are documented alongside specialized infrastructure like a Gaging Sta and a Gravel Pit. Backcountry access is traced through established paths like the Pitchstone Plateau Trail and the Beula Lake Trail, providing a clear view of the region's managed wilderness and recreational corridors before the turn of the millennium.