Fort Simcoe State Park anchors this portion of Yakima County, preserving a mid-19th-century military outpost and later Indian agency site. The landscape is defined by the significant rise of Toppenish Ridge and deep drainage systems like Willy Dick Canyon and Coon Canyon. Water sources such as Mool Mool Spring and Agency Cr have long dictated movement through this high country. Bureau of Indian Affairs routes like Bia 127 RD and Signal Peak RD weave through the complex topography, connecting isolated points like Whiskey Jim Flat and Barbers Flat. A small piece of local genealogy is found at Colwash Cem, while the high point at Satus Peak overlooks the headwaters of Toppenish Cr and Mill Cr.
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1937 · White Swan
USGS Topo · 1:125,000
1950 · Yakima
USGS Topo · 1:250,000
1957 · Yesmowit Canyon
USGS Topo · 1:24,000
1957 · Willy Dick Canyon
USGS Topo · 1:24,000
1958 · Toppenish Mtn.
USGS Topo · 1:24,000
1958 · Fort Simcoe
USGS Topo · 1:24,000
1958 · Fort Simcoe
USGS Topo · 1:62,500
1958 · White Swan
USGS Topo · 1:24,000
1958 · Medicine Valley
USGS Topo · 1:24,000
1958 · Yakima
USGS Topo · 1:250,000