1968 Map of Volcano Reef

About this map

Volcano Reef rises as the dominant geological landmark along the eastern edge of the Lewis and Clark National Forest in this 1968 study. The terrain is defined by a series of dramatic coulees, including Ben English Coulee, Gansman Coulee, and Toms Coulee, which channel runoff from the high ridges down toward the plains. The drainage network is complex, featuring the upper reaches of the Dry Fork Marias River and several branches of Dupuyer Creek. Human activity is sparse but visible through the presence of a Gas Well and several Drill Hole locations, indicating the area's resource exploration history. A network of primitive Pack Trail and Jeep Trail routes provides the only access into the high country of Blackleaf Canyon, reflecting the area's transition from open range to protected forest land.