The Allegheny Reservoir dominates the southern landscape of this Cattaraugus County region, a large body of water that transformed the local geography. The settlement of Onoville sits along the western shoreline, while Steamburg remains a primary hub further north near the Steamburg Cem. The terrain is defined by a series of significant elevations including Pine Hill, Round Top, and High Peak, with numerous deep hollows such as Hotchkiss Hollow and Browns Hollow cutting through the uplands.
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1905 · Jamestown
USGS Topo · 1:62,500
1906 · Warren
USGS Topo · 1:62,500
1907 · Warren
USGS Topo · 1:62,500
1908 · Warren
USGS Topo · 1:62,500
1922 · Randolph
USGS Topo · 1:62,500
1923 · Randolph
USGS Topo · 1:62,500
1936 · Kinzua
USGS Topo · 1:48,000
1941 · Kinzua
USGS Topo · 1:62,500
1942 · Jamestown
USGS Topo · 1:62,500
1943 · Randolph
USGS Topo · 1:62,500