2021 Map of Updegraff Ridge
USGS Topo · Published 2021About this map
The Eel River and its major tributary, the North Fork Eel River, dictate the geography of this remote section of the Mendocino-Trinity county line. These watercourses cut through the steep terrain, joined by numerous drainages such as Bell-Springs Cr, Blue-Rock Cr, and Big-Bend Cr. Settlement is sparse and largely confined to the river corridors and ridgelines, represented by the clusters at Island Mtn, Ramsey, and Spyrock.
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Map Details
Editions of this 2021 Updegraff Ridge Map
This is the sole edition of this map. No revisions or reprints were ever made.
Other maps of this area
1920 · Cummings
USGS Topo · 1:62,500
1920 · Covelo
USGS Topo · 1:62,500
1920 · Harris
USGS Topo · 1:62,500
1921 · Hoaglin
USGS Topo · 1:62,500
1922 · Island Mountain
USGS Topo · 1:62,500
1931 · Hoaglin
USGS Topo · 1:96,000
1935 · Hoaglin
USGS Topo · 1:125,000
1949 · Alderpoint
USGS Topo · 1:62,500
1951 · Alderpoint
USGS Topo · 1:62,500
1952 · Spyrock
USGS Topo · 1:62,500