
Grande Ronde Valley defines this agricultural and hydrological landscape in Union County, where an intricate network of waterways manages the valley floor. The Grande Ronde River and Catherine Cr dominate the natural drainage, supplemented by a complex system of human-engineered features like State Ditch, McAlister Ditch, and Gekeler Slough. This intersection of natural river bends and straightened channels reflects over a century of water management for local ranching and farming operations.
40 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.
1906 · Telocaset
USGS Topo · 1:125,000
1953 · Pendleton
USGS Topo · 1:250,000
1955 · Grangeville
USGS Topo · 1:250,000
1956 · Pendleton
USGS Topo · 1:250,000
1959 · Grangeville
USGS Topo · 1:250,000
1963 · La Grande SE
USGS Topo · 1:24,000
1963 · Summerville
USGS Topo · 1:24,000
1965 · Conley
USGS Topo · 1:24,000
1965 · Glass Hill
USGS Topo · 1:24,000
1965 · Union
USGS Topo · 1:24,000