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Iowa Final Report
Appendix B: County Crop Histories And Drainage Dates

County
1861-1920
1921-1950
1950-1974
Early Drain
Late Drain
Adair C-W-C-O O-M-C C-C-O-M-M
1950
1970
Adams C-W-C-O O-M-C B-C-O-M
1950
1970
Allamakee C-W-M-M-M C-L-M-M-M C-C-O-M-M-M
1940
1960
Appanoose C-W-C-O C-O-M-M-M C-B
1930
1960
Audubon C-O-M-M C-O-M-M C-B-C-O-M
1930
1960
Benton C-C-O-M-M-M C-C-O-M-M-M C-B
1930
1960
Black Hawk C-W-C-O C-O-M-M-M C-B-C-O
1940
1970
Boone C-O-M-M-M C-C-O-M-M C-B-C-O-M
1930
1960
Bremer C-C-O-M-M-M C-O-M-M-M C-C-O-M-M
1930
1960
Buchanan C-C-O-M_ C-C-L-M_ C-C
1940
1970
Buena Vista C-O-C-O-M C-O-M C-B-C-O-C
1930
1960
Butler C-C-O-M-M-M C-C-O-M-M C-C-O-M-M
1950
1970
Calhoun C-O-M-M C-C-O-M-M C-B-C-O-M
1920
1960
Carroll C-O-M-M C-C-O-M-M C-B-C-O-M
1920
1960
Cass
 C-W-C-O O-M-C C-B
1950
1960
Cedar C-C-O-M-M C-C-O-M-M-M C-C-B-O-M-M
1950
1970
Cerro Gordo C-O-C-O C-C-O-M-M C-C-B
1950
1970
Cherokee C-O-M C-C-B-O-M C-B-C-O
1960
1970
Chickasaw C-W-C-O C-O-M-M-M C-B-C-O
1930
1960
Clarke C-W-C-O-M O-M-C C-B-O-M
1960
1970
Clay C-O-C-O C-C-O-M-M C-B-C-O-M
1930
1960
Clayton C-W-C-O C-O-M-M C-C-O-A-A
1950
1970
Clinton C-C-O-M-M-M C-O-M C-C-B-O-M-M
1930
1960
Crawford C-O-C-O C-O-M C-B-C-O
1930
1960
Dallas C-C-O-M-M-M C-C-O-M-M C-C-B
1930
1960
Davis C-W-C-O C-C-O-M-M-M C-C-B-O-M-M
1920
1940
Decatur C-W-C-O O-M-C C-C-O-M-M
1940
1960
Delaware C-W-C-O C-O-M-M-M C-B-C-O
1950
1970
Des Moines C-W-C-O C-C-O-M-M-M C-C-B
1930
1960
Dickinson C-O-C-O C-C-O-M-M C-B-C-O
1930
1970
Dubuque C-W-C-O C-O-M-M-M C-C-O-M-M-M
1940
1970
Emmet C-O-C-O C-C-O-M-M C-B-C-O-M
1900
1920
Fayette C-W-C-O C-O-M-M-M C-B-C-O
1950
1970
Floyd C-C-O-M-M-M C-C-O-M-M C-C-B
1920
1960
Franklin C-C-O-M-M-M C-C-O-M-M C-B-C-O-M-M
1920
1950
Fremont C-W-C-O-M-M C-C-O-M C-B
1910
1950
Greene C-O-C-O C-C-O-M-M C-B-C-O-M
1920
1940
Grundy C-C-O-M-M-M C-C-O-M-M C-C-B-O-M
1930
1960
Guthrie C-O-C-O C-C-O-M-M C-B-C-O-M
1930
1960
Hamilton C-C-O-M-M-M C-C-O-M-M C-C-B
1930
1950
Hancock C-C-O-M-M-M C-C-O-M-M C-C-B
1920
1960
Hardin C-C-O-M-M-M C-C-O-M-M C-C-B
1940
1960
Harrison C-O-C-O C-O-C-O C-B-C-O-M
1950
1970
Henry C-O-M C-C-O-M-M-M C-C-B-O-M-M
1940
1960
Howard C-W-C-O-M C-O-M-M-M C-B-C-O
1940
1970
Humboldt C-C-O-M-M C-C-O-M-M C-B-C-O-M
1910
1940
Ida C-O-C-O-M C-C-O-M-M C-B-C-O-M
1960
1970
Iowa C-W-C-O C-C-O-M-M-M C-C-B
1950
1970
Jackson C-W-C-O-M C-C-O-M-M-M C-C-O-M-M 1930 1960
Jasper C-C-C-O-M C-C-B-O-M C-B-C-O-M 1930 1960
Jefferson C-W-C-O C-C-O-M-M-M C-C-B 1930 1960
Johnson C-W-C-O C-C-O-M-M-M C-C-B-O-M-M 1900 1950
Jones C-C-O-M-M C-C-O-M-M-M C-C-B-O-M-M 1940 1960
Keokuk C-W-C-O C-C-O-M-M-M C-C-B 1930 1960
Kossuth C-C-O-M-M-M C-C-O-M-M C-B-C-O-M 1910 1950
Lee C-W-O-M-M C-W-M C-B-O-M-M 1930 1960
Linn C-W-C-O C-C-O-M-M-M C-C-O-M-M 1930 1960
Louisa C-W-C-O C-C-O-M-M-M C-C-B 1930 1950
Lucas C-O-M O-M-C C-B-O-M-M 1940 1970
Lyon C-O-C-O C-C-O-M-M C-B-C-O-M 1920 1960
Madison C-W-C-O O-M-C C-C-O-M-M 1930 1970
Mahaska C-W-C-O C-O-M-M C-C-B 1950 1970
Marion C-W-C-O O-M-C C-C-O-M-M 1930 1970
Marshall C-C-O-M-M-M C-C-O-M-M C-C-B 1940 1970
Mills C-W-C-O O-M-C C-C-O-M-M 1930 1960
Mitchell C-C-O-M-M-M C-C-O-M-M C-C-B 1930 1960
Monona C-C-O-M-M C-C-O-M-M C-B-O-M-M 1950 1970
Monroe C-W-C-O O-M-C C-C-O-M-M 1930 1960
Montgomery C-W-C-O O-M-C C-B-O-M 1940 1960
Muscatine C-O-M-M-M C-O-M-M C-C-B-O-M-M 1930 1960
O'Brien C-O-C-O-M C-C-O-M-M C-B-C-O-M 1930 1950
Osceola C-O-C-O C-C-O-M-M C-B-C-O-M 1930 1950
Page C-C-O-M-M O-M-C-C C-C-O-M-M 1930 1960
Palo Alto C-O-C-O C-C-O-M-M C-B-C-O-M 1920 1940
Plymouth C-O-C-O-M-M C-C-O-M-M C-B-C-O-M 1930 1960
Pocahontas C-O-C-O C-C-O-M-M C-B-C-O-M-M 1920 1960
Polk C-C-O-M-M-M C-C-O-M-M C-B 1910 1950
Pottawattamie C-W-C-O C-O-M-C C-C-O-M-M 1940 1960
Poweshiek C-C-O-M-M-M C-C-O-M-M C-C-B-O-M 1930 1960
Ringgold C-O-M C-C-O-M-M C-B-O-M-M-M 1940 1970
Sac C-O-C-O C-C-O-M-M C-B-C-O-M 1960 1970
Scott C-W-C-O C-C-O-M-M-M C-C-B-O-M-M 1930 1960
Shelby C-O-C-O C-C-O-M-M C-B-C-O-M 1930 1960
Sioux C-O-C-O C-C-O-M-M C-B-C-O-M 1950 1970
Story C-C-O-M-M-M C-C-O-M-M C-C-B 1920 1940
Tama C-C-O-M-M-M C-C-O-M-M C-C-B 1960 1970
Taylor C-W-C-O O-M-C C-B-O-M 1960 1970
Union C-W-C-O O-M-C C-B-O-M-M 1950 1970
Van Buren C-W-C-O C-C-O-M-M-M C-C-B-O-M-M 1930 1950
Wapello C-W-C-O C-C-O-M-M-M C-C-B-O-M-M 1940 1970
Warren C-W-C-O O-M-C C-C-O-M-M 1930 1960
Washington C-O-M-M C-C-O-M-M-M C-C-B-O-M-M 1930 1960
Wayne C-C-C-O-M-M O-M-C C-C-B-O-M-M 1930 1960
Webster C-C-O-M-M-M C-C-O-M-M C-C-O-B 1900 1920
Winnebago C-C-O-M-M-M C-C-O-M-M C-C-O-M-M 1920 1960
Winneshiek C-W-C-O C-O-M-M-M C-B-C-O 1940 1960
Woodbury C-O-M-M-M C-C-O-M-M C-O-A-A-A 1930 1960
Worth C-C-O-M-M-M C-C-O-M-M C-C-B 1930 1960
Wright C-C-O-M-M-M C-C-O-M-M C-B 1930 1960

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