Slippery Rock Creek defines the local landscape as it carves through the dramatic Slippery Rock Creek Gorge, a central geographic feature of this Butler County region. The waterway is punctuated by several significant crossings, including Kildoo Bridge, Eckert Bridge, and Breakneck Bridge, which speak to the area's historic transit routes. Near the creek's upper reaches, The Wilroy Iron Furnace stands as a marker of the nineteenth-century industrial activity that once utilized local resources.
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1902 · New Castle
USGS Topo · 1:62,500
1904 · Newcastle
USGS Topo · 1:62,500
1905 · Neshannock
USGS Topo · 1:62,500
1907 · Neshannock
USGS Topo · 1:62,500
1908 · Zelienople
USGS Topo · 1:62,500
1910 · Zelienople
USGS Topo · 1:62,500
1913 · Mercer
USGS Topo · 1:62,500
1939 · Mercer
USGS Topo · 1:62,500
1943 · Mercer
USGS Topo · 1:62,500
1950 · Cleveland
USGS Topo · 1:250,000