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Jim Johnson of the Oregon Department of Agriculture supplied us with this map of Northern Malheur County. In it you can see irrigated Exclusive Farm Use land in orange, Exclusive Range Use lands in green, and gray BLM-owned federal lands.
If you include the rest of Malheur County, (note the white & yellow map in an earlier post,) you would see no more EFU land and a great deal more federally owned land.