2019 Map of McGrath D-4 SW

About this map

The Big River winds through this interior Alaskan wilderness, exhibiting a complex network of tight meanders and oxbow lakes that define the low-lying terrain. As shown in this 2019 U.S. Geological Survey study, the landscape is almost entirely dominated by the river's hydrological patterns, with the watercourse shifting across a broad alluvial plain. The absence of any roads or permanent settlements within the grid underscores the isolation of the Yukon-Koyukuk Census Area, where the shifting river channel remains the primary geographical influence on the land. Detailed township and range lines, such as t32n r30w and t31n r30w, provide a cartographic framework for this vast, uninhabited stretch of the interior.