Published soil surveys can be downloaded from the Natural Resources Conservation Service (NRCS).
More current and site specific maps can be created at the Web Soil Survey website
For help using the NRCS Web Soil Survey, WSU Extension has published Forest Soil Data for your Forest Stewardship Plan.
If you know your soil type and need more information about it, go to the Web Site for Official Soil Series Descriptions and Series Classification
Keeping your forest soils healthy and productive. WSU Extension, EB 2019. 40 pages.
Best Management Practices for Maintaining Soil Productivity in the Douglas-fir Region. Edited by Sam D. Angima and Thomas A. Terry. OSU Extension Service, EM 9023. 2011. 44 p.