1956 Map of Black River D-4

About this map

The Lower Porcupine River dominates the northern landscape of this Alaskan interior quadrangle, carving through a stretch known as the Ramparts. In the mid-1950s, this area remained largely unsettled, with a single Cabin located on the riverbank as the only noted structure. The terrain is defined by high elevations, including Frozen Calf Mountain in the west and the prominent Negrohead Mountain in the southeast corner. Numerous triangulation stations, such as VABM 2809 Hud and VABM 1592 Tommy, indicate the significant surveying effort required to map this complex system of ridges and wetlands. South of the main river, the drainage of Rat Creek flows through a landscape marked by numerous small lakes and ponds, illustrating the typical hydrology of the Yukon-Koyukuk region before more modern infrastructure reached these interior reaches.