Water Supply Dams in Iowa
Iowa has 49 water supply dams, of which 2 carry a high hazard classification. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area.
| # | Dam | County | Height (ft) | Hazard | Condition | Year |
|---|---|---|---|---|---|---|
| 1 | Maffitt Reservoir Dam | Dallas | 79 | High | Satisfactory | 1944 |
| 2 | West Lake Dam | Clarke | 58 | Significant | Satisfactory | 1935 |
| 3 | North Woods Lake Dam | Decatur | 57 | Significant | Satisfactory | 1993 |
| 4 | Pheasant Ridge Dam | Dallas | 54 | Significant | Satisfactory | 1972 |
| 5 | Afton Reservoir Dam | Union | 51 | Significant | Satisfactory | 1936 |
| 6 | Cedar Creek Dam | Madison | 50 | Significant | Satisfactory | 1939 |
| 7 | Upper Centerville Reservoir Dam | Appanoose | 48 | Significant | Fair | 1912 |
| 8 | Swine Graphics Dam #2 | Clarke | 47 | Low | Not Rated | 2005 |
| 9 | Swine Graphics #1 | Clarke | 44 | Low | Not Rated | 2000 |
| 10 | Bedford Water Supply Dam | Taylor | 44 | Significant | Fair | 1969 |
| 11 | Lake Fisher Dam | Davis | 43 | Significant | Satisfactory | 1937 |
| 12 | Greenfield Reservoir Dam | Adair | 42 | High | Satisfactory | 1979 |
| 13 | East Lake Dam | Clarke | 41 | Significant | Satisfactory | 1915 |
| 14 | Grand River Cattle Dam | Decatur | 41 | Low | Not Rated | 2007 |
| 15 | Fairfield Water Works Dam No 1 | Jefferson | 40 | Significant | Satisfactory | 1888 |
| 16 | Diamond Lake Dam (poweshiek Co) | Poweshiek | 40 | Significant | Satisfactory | 1952 |
| 17 | Mount Ayr Reservoir Dam | Ringgold | 40 | Significant | Fair | 1930 |
| 18 | Iowa Select Farms Dam | Union | 40 | Low | Not Rated | 1997 |
| 19 | Lower Centerville Reservoir Dam | Appanoose | 39 | Significant | Fair | 1912 |
| 20 | Ledgewood Creek Watershed Site M-2 | Fremont | 39 | Low | Not Rated | 1973 |
| 21 | Lake Morris Dam | Lucas | 39 | Significant | Fair | 1993 |
| 22 | Southwest Iowa Egg Cooperative Dam | Cass | 38 | Low | Not Rated | 1999 |
| 23 | Lake Ellis Dam | Lucas | 38 | Significant | Fair | 1993 |
| 24 | Ledgewood Creek Watershed Site M-3 | Fremont | 37 | Low | Not Rated | 1973 |
| 25 | Nodaway Lake Dam | Adair | 35 | Significant | Fair | 1936 |
| 26 | Binder Lake Dam | Adams | 35 | Significant | Satisfactory | 1942 |
| 27 | Walton Lake Dam | Jefferson | 35 | Significant | Satisfactory | 1900 |
| 28 | Joe Sinclair Dam | Monroe | 35 | Low | 2018 | |
| 29 | Fairfield Waterworks Dam No 2 | Jefferson | 33 | Low | Satisfactory | 1900 |
| 30 | Johnson Dam | Decatur | 32 | Low | Not Rated | 1974 |
| 31 | Humeston Reservoir Dam | Wayne | 31 | Significant | Poor | 1916 |
| 32 | Corning Reservoir Dam | Adams | 30 | Significant | Satisfactory | 1917 |
| 33 | Homepond Dam | Decatur | 30 | Significant | Fair | 1920 |
| 34 | Lake Lashane Dam | Decatur | 30 | Significant | Satisfactory | 1954 |
| 35 | Iowa Noname19 | Henry | 27 | Low | Not Rated | 1957 |
| 36 | East Lenox Reservoir Dam | Adams | 25 | Significant | Satisfactory | 1913 |
| 37 | Old Reservoir Dam | Ringgold | 25 | Low | Not Rated | 1920 |
| 38 | West Lenox Reservoir Dam | Taylor | 25 | Significant | Not Rated | 1913 |
| 39 | Promise City Reservoir Dam | Wayne | 25 | Low | Not Rated | 1900 |
| 40 | Orient Lake Dam | Adair | 23 | Significant | Satisfactory | 1969 |
| 41 | Lake Maharry Dam | Taylor | 21 | Low | Not Rated | 1969 |
| 42 | Iowa Noname79 | Pottawattamie | 19 | Low | Not Rated | 1973 |
| 43 | Hawk Lake Dam | Union | 18 | Low | Not Rated | 1967 |
| 44 | Adel Milldam | Dallas | 15 | Low | Not Rated | 1927 |
| 45 | Mason City-lehigh Cement Milldam | Cerro Gordo | 8 | Low | Not Rated | 1924 |
| 46 | Cedar Rapids Milldam Iel&p | Linn | 8 | Low | Not Rated | 1967 |
| 47 | Boone Milldam | Boone | 7 | Low | Not Rated | 1932 |
| 48 | Rock Rapids Milldam | Lyon | 7 | Low | Not Rated | 1931 |
| 49 | Des Moines-waterworks Dam | Polk | 7 | Low | Not Rated | 1923 |