
Mount Saint Helens National Volcanic Monument and the Gifford Pinchot National Forest converge in this high-altitude landscape of the Cascades. The survey captures a dramatic geological environment defined by the Muddy River, which carves through the Muddy River Gorge south of the prominent Smith Creek Butte. The terrain is marked by significant volcanic features, including the steep walls of Ape Canyon and the basalt formations of Lava Canyon.
24 named features on this map. Tap any name to fly to it.
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This is the sole edition of this map. No revisions or reprints were ever made.
1919 · Mount St Helens
USGS Topo · 1:125,000
1926 · Steamboat Mtn
USGS Topo · 1:125,000
1931 · Steamboat Mtn
USGS Topo · 1:125,000
1950 · Yakima
USGS Topo · 1:250,000
1953 · Hoquiam
USGS Topo · 1:250,000
1957 · Hoquiam
USGS Topo · 1:250,000
1957 · Spirit Lake
USGS Topo · 1:62,500
1958 · Mt St. Helens
USGS Topo · 1:62,500
1958 · Yakima
USGS Topo · 1:250,000
1958 · Hoquiam
USGS Topo · 1:250,000