Sandy Ridge and the surrounding high ground of Centre County define this topography, where the landscape is marked by a series of deeply carved hollows and prominent ridges. Small settlements such as Glass City and Powelton are situated along the winding paths of roads like Ponderosa Dr and S Mountain Rd. The area's water management is anchored by the Philipsburg Reservoir and the associated Upper Dam on Cold Stream, providing a clear look at the infrastructure serving the local community.
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1903 · Houtzdale
USGS Topo · 1:62,500
1905 · Houtzdale
USGS Topo · 1:62,500
1920 · Altoona
USGS Topo · 1:62,500
1922 · Philipsburg
USGS Topo · 1:62,500
1922 · Altoona
USGS Topo · 1:62,500
1923 · Tyrone
USGS Topo · 1:62,500
1929 · Tyrone
USGS Topo · 1:48,000
1933 · Tyrone
USGS Topo · 1:62,500
1939 · Philipsburg
USGS Topo · 1:62,500
1944 · Houtzdale
USGS Topo · 1:24,000