2019 Map of McGrath B-4 NW

About this map

Lone Mtn rises as a prominent landmark in this interior Alaskan landscape, anchoring the northern portion of a quadrangle defined by extensive marshy lowlands and meandering drainage patterns. The southwestern corner is dominated by the Big River, which snakes through a wide valley floor characterized by numerous small ponds and wetland pockets. This 2019 survey illustrates a wilderness nearly devoid of human infrastructure, focusing instead on the complex topography of the central highlands and the hydraulic network that feeds into the river system. The terrain transitions from the steep contours of the mountain slopes into a vast expanse of unpopulated tundra, providing a detailed look at the natural geography within the Yukon-Koyukuk Census Area.