1956 Map of Black River B-5

About this map

Tohulkade Lake anchors a complex network of wetlands and wandering waterways in this mid-1950s interior Alaskan landscape. The terrain is defined by dense contouring that rises toward Bearnose Hill in the northwest, contrasting with the low-lying marshlands that dominate the central and southeastern portions of the sheet. Aerial photographs from 1955 reveal a wilderness of intricate oxbows and unnamed ponds, illustrating the natural hydrological processes of the Yukon-Koyukuk region before significant modern development. The map reflects a period when the Geological Survey was systematically documenting the more remote reaches of the territory, relying on photogrammetric methods to capture the labyrinthine drainage patterns of the Black River basin.