1905 Map of Lake Hopatcong

Evidence of early military and industrial activity is prominent near the Sparta Mountains, specifically the U.S. Navy Powder Depot Railroad and landmarks like Middle Forge and Picatinny Peak. To the south and east, the map captures the transition from mining and milling hubs like Wharton and Dover to the smaller crossroads of Calais Crossroad and Brookside. The course of the Musconetcong River and Rockaway River provides the hydraulic backbone for the region's early growth before modern suburban development transformed the Morris and Sussex county lines.