2017 Map of York Island

About this map

Fort Peck Lake dominates this landscape where the borders of Valley, McCone, and Garfield counties meet in central Montana. The complex shoreline of the reservoir is defined by numerous inlets and promontories, including Perch Bay and Sturgeon Bay to the north, and the expansive Dry Arm to the south. Landforms like Markles Point and Haxby Point provide distinct landmarks for navigating the water's edge, while York Island sits as a solitary landmass within the lake's expanse. The map illustrates the specialized topography of a reservoir-dominated environment, where the inundation of the Missouri River valley created a network of secondary bays such as Bear Creek Bay and Catfish Bay, fundamentally altering the geography of the three adjoining counties.