Oregon State UniversitySpecial Collections & Archives Research Center

Forest Type Maps of Oregon, 1900 - circa 1995

Scope and Content Note

The Forest Type Maps of Oregon document forest composition at the county, region, and statewide level in Oregon from 1900 to the mid-1950s. The U.S. Geological Survey prepared the earliest maps at the beginning of the 20th century; the Pacific Northwest Forest Experiment Station and the Pacific Northwest Region of the U.S. Forest Services prepared the forest type maps for the 1930s-1950s. The collection includes maps prepared by E.D. Buell, Arthur Dodwell, H.D. Langille, J.B. Leiberg, F.G. Plummer, Theodore F. Rixon, and Gilbert Thompson.

The maps depict the type and quality of timber as well as areas of non-forested or de-forested land. Several of the maps in this collection indicate the amount of merchantable timber for a given area as board measure (B.M.) per acre. A board measure is the volume of timber contained in a piece measuring one foot by one foot by one inch thick.

Most of the maps in this collection were prepared in the 1930s-1950s for the Forest Service's Forest Inventory and Analysis Program and other programs focusing on large-scale forest health. The maps depict stand types by species composition, tree diameter, and age as well as noting non-forested lands and recently harvested areas. In addition to this primary information the maps also show the locations of main road systems, county and state boundaries, municipalities, rivers and streams, railroad lines, and note boundaries of townships and ranges.

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