Big Grassy Butte and Gerber Butte rise from the high desert landscape of eastern Idaho, defining a volcanic terrain that spans the border between Jefferson and Fremont Counties. This 2017 U.S. Geological Survey representation documents a transition from the structured township grids to the more complex topography of the Snake River Plain. The elevation gain at Monument Butte and the adjacent Sheepherder peak provides a stark contrast to the surrounding flats. Human activity is marked by a network of long-distance routes, including Egin-Hamer Rd and Hawgood Crossing Rd, which cut through the sagebrush and lava fields. These roads follow the ancient paths of early settlers and cattle drivers, connecting isolated landmarks like Little Grassy Butte and Little Grassy Ridge across the open range.
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1951 · Menan Buttes
USGS Topo · 1:24,000
1951 · Plano
USGS Topo · 1:24,000
1955 · Dubois
USGS Topo · 1:250,000
1955 · Idaho Falls
USGS Topo · 1:250,000
1955 · Ashton
USGS Topo · 1:250,000
1955 · Driggs
USGS Topo · 1:250,000
1958 · Driggs
USGS Topo · 1:250,000
1958 · Dubois
USGS Topo · 1:250,000
1958 · Idaho Falls
USGS Topo · 1:250,000
1958 · Ashton
USGS Topo · 1:250,000