1989 Map of Twin Sisters Mtn.

About this map

Twin Sisters Mountain dominates this high-altitude landscape in the late 1980s, where the peaks of North Twin and South Twin rise sharply above the Mount Baker Wilderness. The area is defined by its drainage systems, with the Middle Fork Nooksack River and South Fork Nooksack River carving through the surrounding Mount Baker National Forest. A high drainage Divide separates several alpine water bodies, including Elbow Lake, Lake Doreen, and Lake Wiseman, while the Bell Pass Trail provides the primary human corridor through the eastern terrain near Bell Pass. The border between Whatcom and Skagit counties runs through the southern portion of the map, cutting across Howard Creek and McGinnis Creek. Notable peaks such as George Peterson Butte anchor the southeastern topography, illustrating the complex vertical relief of this portion of the Cascade Range before the close of the twentieth century.