The high-altitude drainage systems of the northern Cascades define this topography along the international border. Dominated by the northern reaches of the Mount Baker National Forest, the landscape is characterized by a dense network of alpine streams and unnamed tributaries that flow through steep, glacial-carved terrain. The northern edge of the survey identifies the boundary with Canada, marking the transition into British Columbia's wilderness. This 2020 map focuses on the natural hydrography and elevation of the high country, where the lack of roads or settlements highlights the preservation of this montane environment near the 49th parallel.
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This is the sole edition of this map. No revisions or reprints were ever made.
1955 · Concrete
USGS Topo · 1:250,000
1958 · Concrete
USGS Topo · 1:250,000
1962 · Concrete
USGS Topo · 1:250,000
1969 · Remmel Mtn.
USGS Topo · 1:24,000
1969 · Ashnola Pass
USGS Topo · 1:24,000
1969 · Bauerman Ridge
USGS Topo · 1:24,000
2001 · Bauerman Ridge
USGS Topo · 1:24,000
2002 · Ashnola Pass
USGS Topo · 1:24,000
2002 · Remmel Mountain
USGS Topo · 1:24,000
2011 · Ashnola Pass
USGS Topo · 1:24,000