
Swift Reservoir dominates the landscape at the meeting point of Skamania, Cowlitz, and Clark counties, where the Lewis River was harnessed for hydroelectric power. This 1998 revision by the Forest Service highlights a region transitioning into a managed volcanic monument following the 1980 eruption of Mt St Helens. Evidence of the area's complex geology is prominent at the Ape Cave Interpretive Site, featuring the Ape Cave Entrance and Ape Cave Skylight, alongside the Trail of Two Forests Interpretive Trail.
25 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
1940 · Lookout Mtn
USGS Topo · 1:62,500
1941 · Yacolt
USGS Topo · 1:62,500
1948 · Vancouver
USGS Topo · 1:250,000
1950 · Vancouver
USGS Topo · 1:250,000
1950 · Vancouver
USGS Topo · 1:250,000
1953 · Hoquiam
USGS Topo · 1:250,000
1953 · Lookout Mtn
USGS Topo · 1:62,500
1953 · Cougar
USGS Topo · 1:62,500
1956 · Yacolt
USGS Topo · 1:62,500