First Fork Sinnemahoning Creek serves as the primary drainage through this stretch of Potter County, where the small settlements of Costello and Wharton anchor a landscape defined by deep, naming-rich hollows. The confluence of Freeman Run at Costello reveals a pattern of historic development along the valley floor, supported by several local burial grounds including Saint Joseph Cemetery and Costello Cemetery. The topography is marked by numerous family-named and descriptive landforms like Kirkendahl Hollow, Big Carlson Hollow, and Railroad Hollow, the latter hinting at the area's industrial past. A notable legacy of the region's early river management can be found in the Splash Dam located near Brainard Hollow, while Wharton Cemetery sits near the southern end of the sheet, providing a geographic record of the families who settled this timber and water-rich corridor.
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1945 · Driftwood
USGS Topo · 1:48,000
1945 · First Fork
USGS Topo · 1:24,000
1945 · Cameron
USGS Topo · 1:24,000
1946 · Renovo West
USGS Topo · 1:62,500
1946 · Hammersley Fork
USGS Topo · 1:24,000
1947 · Cameron
USGS Topo · 1:24,000
1947 · First Fork
USGS Topo · 1:24,000
1947 · Conrad
USGS Topo · 1:62,500
1947 · Conrad
USGS Topo · 1:24,000
1947 · Ayers Hill
USGS Topo · 1:24,000