The Okanogan River carves a central path through this part of Okanogan County, anchoring the commercial and residential hubs of Omak and Okanogan. This modern survey documents the complex irrigation network essential to the region's agricultural identity, featuring the Highline Ditch, Lowline Ditch, and Main Ditch which draw water toward the fertile terraces of Pogue Flat and Robinson Flat. These engineering works transformed the naturally arid landscape into a productive valley, supported by the proximity of the Okanogan River Bridge.
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1902 · Osoyoos
USGS Topo · 1:125,000
1904 · Osoyoos
USGS Topo · 1:125,000
1905 · Okanogan
USGS Topo · 1:125,000
1906 · Chopaka
USGS Topo · 1:125,000
1953 · Omak Lake
USGS Topo · 1:62,500
1954 · Okanogan
USGS Topo · 1:250,000
1957 · Okanogan
USGS Topo · 1:62,500
1957 · Conconully
USGS Topo · 1:62,500
1957 · Tonasket
USGS Topo · 1:62,500
1958 · Okanogan
USGS Topo · 1:250,000