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Creator
- Finley, William L. (William Lovell), 1876-1953 12
- Tobey, Willard F. 12
- United States. Army. Office of the Chief of Engineers 9
- Henderson, Robert W. (Robert Wesley), 1914-2006 6
- Povey Brothers 6
- Vonderahe, Henry 4
- Dukehart, John K. 2
- Johnson Wallwork & Dukehart 2
- Johnson, Folger 2
- Wallwork, Carl H. 2
- Civilian Conservation Corps (U.S.) 1
- Maguire, Stephen D. 1
- McClaran, Elmer E. 1
- Oregon State University. Agricultural Experiment Station 1
- Shelley, Robert 1
- United States. Forest Service 1
