The international border with Canada defines the southern edge of this remote wilderness area, which sits within the northernmost reaches of the Mount Baker National Forest. This 2020 survey records a landscape shaped by a dense network of high-altitude drainages and tributaries, many of which remain unnamed on this specific sheet. The lack of roads or established settlements on this map underscores the wild nature of the North Cascades during this era, serving as a clean record of the region's natural hydrography and terrain before any future human infrastructure or major forest management changes. It is a focused study of the drainage patterns flowing north into British Columbia and south toward the heart of the national forest.
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This is the sole edition of this map. No revisions or reprints were ever made.
1920 · Slate Pass
USGS Topo · 1:125,000
1955 · Concrete
USGS Topo · 1:250,000
1958 · Concrete
USGS Topo · 1:250,000
1962 · Concrete
USGS Topo · 1:250,000
1969 · Skagit Peak
USGS Topo · 1:24,000
1969 · Frosty Creek
USGS Topo · 1:24,000
2002 · Skagit Peak
USGS Topo · 1:24,000
2002 · Frosty Creek
USGS Topo · 1:24,000
2002 · Castle Peak
USGS Topo · 1:24,000
2011 · Skagit Peak
USGS Topo · 1:24,000