Plats for the Vale and Owyhee Irrigation Projects prepared in the 1930s are included. Boundaries of the Umatilla, Malheur, and Klamath Indian Reservations are shown on the plats. Regions depicted in this collection include the Umatilla River basin, Blue Mountains, John Day River basin and tributaries, Snake River, Deschutes River, and Klamath Basin. These plats cover from Townships 4N to 41S and Ranges 6E to 37 E. Most sheets have a scale of about 1:31,680 or 2 inches = 1 mile the remainder are at a smaller scale of about 1.5 inches = 1 mile. Each township of 36 square miles is on a separate sheet. Surveyor General most of the maps were prepared in the 1870-1890s. The Central and Eastern Oregon Township Plats consist of reproductions of the original manuscript plat maps for townships in regions of Oregon east of the Cascade Mountains prepared by the U.S.
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