128Total Dams
2High Hazard
5Significant
Dam Safety in Union County, Iowa
Union County has 128 dams tracked in the National Inventory of Dams. Of these, 2 are classified as high hazard — meaning failure would probably cause loss of human life. Another 5 carry a significant hazard classification.
The average dam in Union County is 41 years old. The most common purpose is fire protection, stock, or small fish pond. The tallest dam is Twelve Mile Creek Watershed Site M-1 at 66 ft.
Explore more: Oldest dams in Iowa · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Twelve Mile Creek Watershed Site M-1 | High | Satisfactory | 66 | Flood Risk Reduction | 1983 |
| Creston Flood Prevention Dam | High | Fair | 27 | Flood Risk Reduction | 1975 |
| Three Mile Reservoir Dam | Significant | Satisfactory | 63 | Flood Risk Reduction | 1995 |
| Afton Reservoir Dam | Significant | Satisfactory | 51 | Water Supply | 1936 |
| Green Valley Lake Dam | Significant | Fair | 41 | Recreation | 1953 |
| Twelve Mile Creek Watershed Site D-62-1 | Significant | Satisfactory | 35 | Flood Risk Reduction | 1985 |
| Mc Kinley Lake Dam | Significant | Satisfactory | 19 | Recreation | 1920 |
| Beattie Dam | Low | Not assessed | 43 | Fire Protection, Stock, Or Small Fish Pond | 1966 |
| Iowa Select Farms Dam | Low | Not assessed | 40 | Water Supply | 1997 |
| Union County Roadgrade Dam 29-73-29 | Low | Not assessed | 39 | Other | 1993 |
| Twelvemile Creek Watershed Site D-41-a2 | Low | Not assessed | 38 | Fire Protection, Stock, Or Small Fish Pond | 1999 |
| Twelve Mile Creek Watershed Site D-35 | Low | Not assessed | 38 | Fire Protection, Stock, Or Small Fish Pond | 1988 |
| Three Mile Creek Watershed Site 49 | Low | Not assessed | 37 | Fire Protection, Stock, Or Small Fish Pond | 1976 |
| Iowa Noname75 | Low | Not assessed | 36 | Fire Protection, Stock, Or Small Fish Pond | 1977 |
| Twelve Mile Creek Watershed Site 18 | Low | Not assessed | 36 | Fire Protection, Stock, Or Small Fish Pond | 1986 |
| Twelve Mile Creek Watershed Site D-44-1 | Low | Not assessed | 36 | Flood Risk Reduction | 2008 |
| Three Mile Creek Watershed Site 33 | Low | Not assessed | 36 | Fire Protection, Stock, Or Small Fish Pond | 1976 |
| Twelve Mile Creek Watershed Site 62-5 | Low | Not assessed | 36 | Grade Stabilization | 2003 |
| Twelve Mile Creek Watershed Site D-41-a-5 | Low | Not assessed | 36 | Flood Risk Reduction | 2006 |
| Twelvemile Watershed Site D-60 | Low | Not assessed | 35 | Fire Protection, Stock, Or Small Fish Pond | 1999 |
| Twelve Mile Creek Watershed Site 30 | Low | Not assessed | 35 | Fire Protection, Stock, Or Small Fish Pond | 1986 |
| Three Mile Creek Watershed Site 42 | Low | Not assessed | 35 | Other | 1970 |
| Three Mile Creek Watershed Site 36 | Low | Not assessed | 35 | Fire Protection, Stock, Or Small Fish Pond | 1976 |
| Three Mile Creek Watershed Site 52-1 | Low | Not assessed | 35 | Fire Protection, Stock, Or Small Fish Pond | 1976 |
| Weis Dam | Low | Not assessed | 34 | Fire Protection, Stock, Or Small Fish Pond | 1971 |
| Deer Ridge Dam | Low | Not assessed | 34 | Recreation | 1983 |
| David Downey Dam | Low | Not assessed | 34 | Grade Stabilization | 2013 |
| Twelve Mile Creek Watershed Site D-44 | Low | Not assessed | 34 | Flood Risk Reduction | 2003 |
| Cheers Dam | Low | Not assessed | 33 | Grade Stabilization | 2005 |
| Twelve Mile Creek Watershed Site 23 | Low | Not assessed | 33 | Fire Protection, Stock, Or Small Fish Pond | 1988 |
| Three Mile Creek Watershed Site 29 | Low | Not assessed | 33 | Fire Protection, Stock, Or Small Fish Pond | 1970 |
| Three Mile Creek Watershed Site 3 | Low | Not assessed | 33 | Fire Protection, Stock, Or Small Fish Pond | 1970 |
| Twelve Mile Creek Watershed Site 40-1 | Low | Not assessed | 33 | Fire Protection, Stock, Or Small Fish Pond | 1993 |
| Twelve Mile Creek Watershed Site D-41-a-3 | Low | Not assessed | 33 | Flood Risk Reduction | 2006 |
| Three Mile Creek Watershed Site 50-1 | Low | Not assessed | 33 | Fire Protection, Stock, Or Small Fish Pond | 1976 |
| Abell Dam | Low | Not assessed | 32 | Fire Protection, Stock, Or Small Fish Pond | 1987 |
| Matt Brown Dam | Low | Not assessed | 32 | Grade Stabilization | 2019 |
| Beattle Dam | Low | Not assessed | 32 | Fire Protection, Stock, Or Small Fish Pond | 1969 |
| Ripperger Dam | Low | Not assessed | 32 | Fire Protection, Stock, Or Small Fish Pond | 1983 |
| Carl Kirkland Dam | Low | Not assessed | 32 | Grade Stabilization | 2014 |
| Bower Off-road Dam | Low | Not assessed | 32 | Fire Protection, Stock, Or Small Fish Pond | 1990 |
| Twelve Mile Creek Watershed Site 48 | Low | Not assessed | 32 | Fire Protection, Stock, Or Small Fish Pond | 1985 |
| Three Mile Creek Watershed Site 58 | Low | Not assessed | 32 | Fire Protection, Stock, Or Small Fish Pond | 1968 |
| Twelve Mile Creek Watershed Site D-41a4 | Low | Not assessed | 32 | Fire Protection, Stock, Or Small Fish Pond | 1993 |
| Three Mile Creek Watershed Site 43-1 | Low | Not assessed | 32 | Fire Protection, Stock, Or Small Fish Pond | 1976 |
| Stickles Dam | Low | Not assessed | 31 | Fire Protection, Stock, Or Small Fish Pond | 1977 |
| Kuhl Dam | Low | Not assessed | 31 | Fire Protection, Stock, Or Small Fish Pond | 1997 |
| Cramer Farms Dam | Low | Not assessed | 31 | Fire Protection, Stock, Or Small Fish Pond | 1976 |
| Twelve Mile Creek Watershed Site 36 | Low | Not assessed | 31 | Grade Stabilization | 2003 |
| Twelve Mile Creek Watershed Site 27 | Low | Not assessed | 31 | Fire Protection, Stock, Or Small Fish Pond | 1986 |
| Three Mile Creek Watershed Site 9 | Low | Not assessed | 31 | Other | 1970 |
| Three Mile Creek Watershed Site 45-1 | Low | Not assessed | 31 | Other | 1970 |
| Three Mile Creek Watershed Site 14-g | Low | Not assessed | 31 | Fire Protection, Stock, Or Small Fish Pond | 1970 |
| Three Mile Creek Watershed Site 45-2 | Low | Not assessed | 31 | Fire Protection, Stock, Or Small Fish Pond | 1970 |
| Three Mile Creek Watershed Site 50-2 | Low | Not assessed | 31 | Flood Risk Reduction | 1980 |
| Mc Donald Dam | Low | Not assessed | 30 | Fire Protection, Stock, Or Small Fish Pond | 2001 |
| Brown Dam | Low | Not assessed | 30 | Fire Protection, Stock, Or Small Fish Pond | 1978 |
| Matthew Brown | Low | Not assessed | 30 | Grade Stabilization | 2018 |
| Thayer Lake Dam | Low | Not assessed | 30 | Recreation | 1930 |
| Twelve Mile Creek Watershed Site 73 | Low | Not assessed | 30 | Fire Protection, Stock, Or Small Fish Pond | 1979 |
| Twelve Mile Creek Watershed Site 35-2 | Low | Not assessed | 30 | Fire Protection, Stock, Or Small Fish Pond | 1986 |
| Twelve Mile Creek Watershed Site 62-4 | Low | Not assessed | 30 | Fire Protection, Stock, Or Small Fish Pond | 1979 |
| Mc Guire Dam | Low | Not assessed | 29 | Fire Protection, Stock, Or Small Fish Pond | 2003 |
| Crittenden Dam | Low | Not assessed | 29 | Fire Protection, Stock, Or Small Fish Pond | 1977 |
| Erickson Dam | Low | Not assessed | 29 | Grade Stabilization | 2006 |
| Claiser Dam | Low | Not assessed | 29 | Fire Protection, Stock, Or Small Fish Pond | 1974 |
| Hayes Cattle Company Dam | Low | Not assessed | 29 | Grade Stabilization | 2017 |
| East Fork Grand River Watershed Site A-32 | Low | Not assessed | 29 | Flood Risk Reduction | 2005 |
| Cheers Dam | Low | Not assessed | 28 | Fire Protection, Stock, Or Small Fish Pond | 1994 |
| Henco Dam | Low | Not assessed | 28 | Fire Protection, Stock, Or Small Fish Pond | 1982 |
| Brown Dam | Low | Not assessed | 28 | Fire Protection, Stock, Or Small Fish Pond | 1966 |
| Granfield/westrum Dam | Low | Not assessed | 28 | Fire Protection, Stock, Or Small Fish Pond | 1977 |
| Smith (bill) Dam | Low | Not assessed | 28 | Grade Stabilization | 2013 |
| Twelve Mile Creek Watershed Site 58 | Low | Not assessed | 28 | Fire Protection, Stock, Or Small Fish Pond | 1985 |
| Twelve Mile Creek Watershed Site 46 | Low | Not assessed | 28 | Fire Protection, Stock, Or Small Fish Pond | 1993 |
| Twelve Mile Creek Watershed Site 67 | Low | Not assessed | 28 | Fire Protection, Stock, Or Small Fish Pond | 1979 |
| Twelve Mile Creek Watershed Site 68-1 | Low | Not assessed | 28 | Fire Protection, Stock, Or Small Fish Pond | 1979 |
| Three Mile Creek Watershed Site U-4 | Low | Not assessed | 28 | Fire Protection, Stock, Or Small Fish Pond | 1980 |
| Three Mile Creek Watershed Site U-5-b | Low | Not assessed | 28 | Fire Protection, Stock, Or Small Fish Pond | 1980 |
| Ripperger Dam | Low | Not assessed | 27 | Fire Protection, Stock, Or Small Fish Pond | 1986 |
| Kelly Dam | Low | Not assessed | 27 | Fire Protection, Stock, Or Small Fish Pond | 2002 |
| Wittstock Dam | Low | Not assessed | 27 | Fire Protection, Stock, Or Small Fish Pond | 1977 |
| Ridinger Dam | Low | Not assessed | 27 | Fire Protection, Stock, Or Small Fish Pond | 1964 |
| Miller-main Dam | Low | Not assessed | 27 | Fire Protection, Stock, Or Small Fish Pond | 1990 |
| Double Time Farms Dam | Low | Not assessed | 27 | Fire Protection, Stock, Or Small Fish Pond | 1992 |
| East Fork Grand River Watershed Site A-34 | Low | Not assessed | 27 | Flood Risk Reduction | 2008 |
| Three Mile Creek Watershed Site U-7 | Low | Not assessed | 27 | Fire Protection, Stock, Or Small Fish Pond | 1980 |
| Twelve Mile Creek Watershed Site 72-1 | Low | Not assessed | 27 | Fire Protection, Stock, Or Small Fish Pond | 1979 |
| Three Mile Creek Watershed Site 14-g-1 | Low | Not assessed | 27 | Fire Protection, Stock, Or Small Fish Pond | 1976 |
| Gennaro Dam | Low | Not assessed | 26 | Grade Stabilization | 2006 |
| Summit Lake Dam | Low | Satisfactory | 26 | Recreation | 1935 |
| Iowa Noname53 | Low | Not assessed | 26 | Fire Protection, Stock, Or Small Fish Pond | 1972 |
| Three Mile Lake Sediment Dam | Low | Not assessed | 26 | Other | 1999 |
| East Fork Grand River Watershed Site A-54 | Low | Not assessed | 26 | Flood Risk Reduction | 2008 |
| Three Mile Creek Watershed Site U-2 | Low | Not assessed | 26 | Fire Protection, Stock, Or Small Fish Pond | 1980 |
| Downing Dam | Low | Not assessed | 25 | Fire Protection, Stock, Or Small Fish Pond | 1994 |
| Kirk Joy Dam | Low | Not assessed | 25 | Fire Protection, Stock, Or Small Fish Pond | 1987 |
| Talmage Hill Dam | Low | Not assessed | 25 | Recreation | 1985 |
| Houghton Dam | Low | Not assessed | 25 | Fire Protection, Stock, Or Small Fish Pond | 1967 |
| Milligan Dam | Low | Not assessed | 25 | Fire Protection, Stock, Or Small Fish Pond | 1973 |
| Liken Family Farm Dam | Low | Not assessed | 25 | Fire Protection, Stock, Or Small Fish Pond | 1986 |
| Three Mile Creek Watershed Site 14-m | Low | Not assessed | 25 | Other | 1976 |
| Twelve Mile Creek Watershed Site 68-2 | Low | Not assessed | 25 | Fire Protection, Stock, Or Small Fish Pond | 1979 |
| East Fork Grand River Watershed Site A-35 | Low | Not assessed | 25 | Flood Risk Reduction | 2011 |
| Wasteney Dam | Low | Not assessed | 24 | Fire Protection, Stock, Or Small Fish Pond | 1977 |
| Hubbard Dam | Low | Not assessed | 24 | Recreation | 1971 |
| East Fork Grand River Watershed Site A-40 | Low | Not assessed | 24 | Flood Risk Reduction | 2005 |
| East Fork Grand River Watershed Site A-37 | Low | Not assessed | 24 | Flood Risk Reduction | 2005 |
| Three Mile Creek Watershed Site U-5-a | Low | Not assessed | 24 | Fire Protection, Stock, Or Small Fish Pond | 1980 |
| Twelve Mile Creek Watershed Site 71 | Low | Not assessed | 23 | Fire Protection, Stock, Or Small Fish Pond | 1993 |
| Twelve Mile Creek Watershed Site 72-2 | Low | Not assessed | 23 | Fire Protection, Stock, Or Small Fish Pond | 1979 |
| East Fork Grand River Watershed Site A-53 | Low | Not assessed | 23 | Flood Risk Reduction | 2008 |
| Three Mile Creek Watershed Site 14-p | Low | Not assessed | 23 | Fire Protection, Stock, Or Small Fish Pond | 1976 |
| Three Mile Creek Watershed Site U-3 | Low | Not assessed | 23 | Fire Protection, Stock, Or Small Fish Pond | 1980 |
| Dory Dam | Low | Not assessed | 22 | Fire Protection, Stock, Or Small Fish Pond | 1985 |
| Hiatt Dam | Low | Not assessed | 22 | Fire Protection, Stock, Or Small Fish Pond | 1968 |
| East Fork Grand River Watershed Site A-36 | Low | Not assessed | 22 | Grade Stabilization | 2001 |
| East Fork Grand River Watershed Site A-30 | Low | Not assessed | 22 | Flood Risk Reduction | 2005 |
| Twelve Mile Creek Watershed Site 77 | Low | Not assessed | 22 | Fire Protection, Stock, Or Small Fish Pond | 1979 |
| East Fork Grand River Watershed Site A-55 | Low | Not assessed | 22 | Flood Risk Reduction | 2008 |
| Travis Dam | Low | Not assessed | 21 | Fire Protection, Stock, Or Small Fish Pond | 1967 |
| Sharp Dam | Low | Not assessed | 21 | Fire Protection, Stock, Or Small Fish Pond | 1980 |
| Maxwell Dam | Low | Not assessed | 21 | Fire Protection, Stock, Or Small Fish Pond | 1983 |
| East Fork Grand River Watershed Site A-31 | Low | Not assessed | 21 | Flood Risk Reduction | 2005 |
| Crestmor Golf Club Dam | Low | Not assessed | 20 | Recreation | 1994 |
| Cheers Dam | Low | Not assessed | 18 | Fire Protection, Stock, Or Small Fish Pond | 1970 |
| Hawk Lake Dam | Low | Not assessed | 18 | Water Supply | 1967 |
| Van Hall Dam | Low | Not assessed | 8 | Other | 1995 |