The Willamette Valley Sketch Map consists of three reproductions of the manuscript map, Sketch of the Wallamette Valley: Showing the purchases and reservations made by the Board of Commissioners, appointed to treat with the Indians of Oregon, April and May 1851 prepared by George Gibbs and Edmond A. Starling. The map shows settlements, tribal lands, and rivers as well as vegetation and some individual land ownership.
The original map is held in the National Archives. The original is 30.5 x 50 inches and has a scale of 4 miles to the inch. The 3 reproductions that comprise this collection vary in quality, but appear to have been made in the early 1970s. Two are about two-thirds of the original's size (23 x 35 inches) and the third is approximately half the size of the original (15 x 21 inches).