Dams in Union County, Iowa
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 Rated | 43 | Fire Protection, Stock, Or Small Fish Pond | 1966 |
| Iowa Select Farms Dam | Low | Not Rated | 40 | Water Supply | 1997 |
| Union County Roadgrade Dam 29-73-29 | Low | Not Rated | 39 | Other | 1993 |
| Twelvemile Creek Watershed Site D-41-a2 | Low | Not Rated | 38 | Fire Protection, Stock, Or Small Fish Pond | 1999 |
| Twelve Mile Creek Watershed Site D-35 | Low | Not Rated | 38 | Fire Protection, Stock, Or Small Fish Pond | 1988 |
| Three Mile Creek Watershed Site 49 | Low | Not Rated | 37 | Fire Protection, Stock, Or Small Fish Pond | 1976 |
| Iowa Noname75 | Low | Not Rated | 36 | Fire Protection, Stock, Or Small Fish Pond | 1977 |
| Twelve Mile Creek Watershed Site 18 | Low | Not Rated | 36 | Fire Protection, Stock, Or Small Fish Pond | 1986 |
| Twelve Mile Creek Watershed Site D-44-1 | Low | Not Rated | 36 | Flood Risk Reduction | 2008 |
| Three Mile Creek Watershed Site 33 | Low | Not Rated | 36 | Fire Protection, Stock, Or Small Fish Pond | 1976 |
| Twelve Mile Creek Watershed Site 62-5 | Low | Not Rated | 36 | Grade Stabilization | 2003 |
| Twelve Mile Creek Watershed Site D-41-a-5 | Low | Not Rated | 36 | Flood Risk Reduction | 2006 |
| Twelvemile Watershed Site D-60 | Low | Not Rated | 35 | Fire Protection, Stock, Or Small Fish Pond | 1999 |
| Twelve Mile Creek Watershed Site 30 | Low | Not Rated | 35 | Fire Protection, Stock, Or Small Fish Pond | 1986 |
| Three Mile Creek Watershed Site 42 | Low | Not Rated | 35 | Other | 1970 |
| Three Mile Creek Watershed Site 36 | Low | Not Rated | 35 | Fire Protection, Stock, Or Small Fish Pond | 1976 |
| Three Mile Creek Watershed Site 52-1 | Low | Not Rated | 35 | Fire Protection, Stock, Or Small Fish Pond | 1976 |
| Weis Dam | Low | Not Rated | 34 | Fire Protection, Stock, Or Small Fish Pond | 1971 |
| Deer Ridge Dam | Low | Not Rated | 34 | Recreation | 1983 |
| David Downey Dam | Low | Not Rated | 34 | Grade Stabilization | 2013 |
| Twelve Mile Creek Watershed Site D-44 | Low | Not Rated | 34 | Flood Risk Reduction | 2003 |
| Cheers Dam | Low | Not Rated | 33 | Grade Stabilization | 2005 |
| Twelve Mile Creek Watershed Site 23 | Low | Not Rated | 33 | Fire Protection, Stock, Or Small Fish Pond | 1988 |
| Three Mile Creek Watershed Site 29 | Low | Not Rated | 33 | Fire Protection, Stock, Or Small Fish Pond | 1970 |
| Three Mile Creek Watershed Site 3 | Low | Not Rated | 33 | Fire Protection, Stock, Or Small Fish Pond | 1970 |
| Twelve Mile Creek Watershed Site 40-1 | Low | Not Rated | 33 | Fire Protection, Stock, Or Small Fish Pond | 1993 |
| Twelve Mile Creek Watershed Site D-41-a-3 | Low | Not Rated | 33 | Flood Risk Reduction | 2006 |
| Three Mile Creek Watershed Site 50-1 | Low | Not Rated | 33 | Fire Protection, Stock, Or Small Fish Pond | 1976 |
| Abell Dam | Low | Not Rated | 32 | Fire Protection, Stock, Or Small Fish Pond | 1987 |
| Matt Brown Dam | Low | 32 | Grade Stabilization | 2019 | |
| Beattle Dam | Low | Not Rated | 32 | Fire Protection, Stock, Or Small Fish Pond | 1969 |
| Ripperger Dam | Low | Not Rated | 32 | Fire Protection, Stock, Or Small Fish Pond | 1983 |
| Carl Kirkland Dam | Low | Not Rated | 32 | Grade Stabilization | 2014 |
| Bower Off-road Dam | Low | Not Rated | 32 | Fire Protection, Stock, Or Small Fish Pond | 1990 |
| Twelve Mile Creek Watershed Site 48 | Low | Not Rated | 32 | Fire Protection, Stock, Or Small Fish Pond | 1985 |
| Three Mile Creek Watershed Site 58 | Low | Not Rated | 32 | Fire Protection, Stock, Or Small Fish Pond | 1968 |
| Twelve Mile Creek Watershed Site D-41a4 | Low | Not Rated | 32 | Fire Protection, Stock, Or Small Fish Pond | 1993 |
| Three Mile Creek Watershed Site 43-1 | Low | Not Rated | 32 | Fire Protection, Stock, Or Small Fish Pond | 1976 |
| Stickles Dam | Low | Not Rated | 31 | Fire Protection, Stock, Or Small Fish Pond | 1977 |
| Kuhl Dam | Low | Not Rated | 31 | Fire Protection, Stock, Or Small Fish Pond | 1997 |
| Cramer Farms Dam | Low | Not Rated | 31 | Fire Protection, Stock, Or Small Fish Pond | 1976 |
| Twelve Mile Creek Watershed Site 36 | Low | Not Rated | 31 | Grade Stabilization | 2003 |
| Twelve Mile Creek Watershed Site 27 | Low | Not Rated | 31 | Fire Protection, Stock, Or Small Fish Pond | 1986 |
| Three Mile Creek Watershed Site 9 | Low | Not Rated | 31 | Other | 1970 |
| Three Mile Creek Watershed Site 45-1 | Low | Not Rated | 31 | Other | 1970 |
| Three Mile Creek Watershed Site 14-g | Low | Not Rated | 31 | Fire Protection, Stock, Or Small Fish Pond | 1970 |
| Three Mile Creek Watershed Site 45-2 | Low | Not Rated | 31 | Fire Protection, Stock, Or Small Fish Pond | 1970 |
| Three Mile Creek Watershed Site 50-2 | Low | Not Rated | 31 | Flood Risk Reduction | 1980 |
| Mc Donald Dam | Low | Not Rated | 30 | Fire Protection, Stock, Or Small Fish Pond | 2001 |
| Brown Dam | Low | Not Rated | 30 | Fire Protection, Stock, Or Small Fish Pond | 1978 |
| Matthew Brown | Low | 30 | Grade Stabilization | 2018 | |
| Thayer Lake Dam | Low | Not Rated | 30 | Recreation | 1930 |
| Twelve Mile Creek Watershed Site 73 | Low | Not Rated | 30 | Fire Protection, Stock, Or Small Fish Pond | 1979 |
| Twelve Mile Creek Watershed Site 35-2 | Low | Not Rated | 30 | Fire Protection, Stock, Or Small Fish Pond | 1986 |
| Twelve Mile Creek Watershed Site 62-4 | Low | Not Rated | 30 | Fire Protection, Stock, Or Small Fish Pond | 1979 |
| Mc Guire Dam | Low | Not Rated | 29 | Fire Protection, Stock, Or Small Fish Pond | 2003 |
| Crittenden Dam | Low | Not Rated | 29 | Fire Protection, Stock, Or Small Fish Pond | 1977 |
| Erickson Dam | Low | Not Rated | 29 | Grade Stabilization | 2006 |
| Claiser Dam | Low | Not Rated | 29 | Fire Protection, Stock, Or Small Fish Pond | 1974 |
| Hayes Cattle Company Dam | Low | 29 | Grade Stabilization | 2017 | |
| East Fork Grand River Watershed Site A-32 | Low | Not Rated | 29 | Flood Risk Reduction | 2005 |
| Cheers Dam | Low | Not Rated | 28 | Fire Protection, Stock, Or Small Fish Pond | 1994 |
| Henco Dam | Low | Not Rated | 28 | Fire Protection, Stock, Or Small Fish Pond | 1982 |
| Brown Dam | Low | Not Rated | 28 | Fire Protection, Stock, Or Small Fish Pond | 1966 |
| Granfield/westrum Dam | Low | Not Rated | 28 | Fire Protection, Stock, Or Small Fish Pond | 1977 |
| Smith (bill) Dam | Low | Not Rated | 28 | Grade Stabilization | 2013 |
| Twelve Mile Creek Watershed Site 58 | Low | Not Rated | 28 | Fire Protection, Stock, Or Small Fish Pond | 1985 |
| Twelve Mile Creek Watershed Site 46 | Low | Not Rated | 28 | Fire Protection, Stock, Or Small Fish Pond | 1993 |
| Twelve Mile Creek Watershed Site 67 | Low | Not Rated | 28 | Fire Protection, Stock, Or Small Fish Pond | 1979 |
| Twelve Mile Creek Watershed Site 68-1 | Low | Not Rated | 28 | Fire Protection, Stock, Or Small Fish Pond | 1979 |
| Three Mile Creek Watershed Site U-4 | Low | Not Rated | 28 | Fire Protection, Stock, Or Small Fish Pond | 1980 |
| Three Mile Creek Watershed Site U-5-b | Low | Not Rated | 28 | Fire Protection, Stock, Or Small Fish Pond | 1980 |
| Ripperger Dam | Low | Not Rated | 27 | Fire Protection, Stock, Or Small Fish Pond | 1986 |
| Kelly Dam | Low | Not Rated | 27 | Fire Protection, Stock, Or Small Fish Pond | 2002 |
| Wittstock Dam | Low | Not Rated | 27 | Fire Protection, Stock, Or Small Fish Pond | 1977 |
| Ridinger Dam | Low | Not Rated | 27 | Fire Protection, Stock, Or Small Fish Pond | 1964 |
| Miller-main Dam | Low | Not Rated | 27 | Fire Protection, Stock, Or Small Fish Pond | 1990 |
| Double Time Farms Dam | Low | Not Rated | 27 | Fire Protection, Stock, Or Small Fish Pond | 1992 |
| East Fork Grand River Watershed Site A-34 | Low | Not Rated | 27 | Flood Risk Reduction | 2008 |
| Three Mile Creek Watershed Site U-7 | Low | Not Rated | 27 | Fire Protection, Stock, Or Small Fish Pond | 1980 |
| Twelve Mile Creek Watershed Site 72-1 | Low | Not Rated | 27 | Fire Protection, Stock, Or Small Fish Pond | 1979 |
| Three Mile Creek Watershed Site 14-g-1 | Low | Not Rated | 27 | Fire Protection, Stock, Or Small Fish Pond | 1976 |
| Gennaro Dam | Low | Not Rated | 26 | Grade Stabilization | 2006 |
| Summit Lake Dam | Low | Satisfactory | 26 | Recreation | 1935 |
| Iowa Noname53 | Low | Not Rated | 26 | Fire Protection, Stock, Or Small Fish Pond | 1972 |
| Three Mile Lake Sediment Dam | Low | Not Rated | 26 | Other | 1999 |
| East Fork Grand River Watershed Site A-54 | Low | Not Rated | 26 | Flood Risk Reduction | 2008 |
| Three Mile Creek Watershed Site U-2 | Low | Not Rated | 26 | Fire Protection, Stock, Or Small Fish Pond | 1980 |
| Downing Dam | Low | Not Rated | 25 | Fire Protection, Stock, Or Small Fish Pond | 1994 |
| Kirk Joy Dam | Low | Not Rated | 25 | Fire Protection, Stock, Or Small Fish Pond | 1987 |
| Talmage Hill Dam | Low | Not Rated | 25 | Recreation | 1985 |
| Houghton Dam | Low | Not Rated | 25 | Fire Protection, Stock, Or Small Fish Pond | 1967 |
| Milligan Dam | Low | Not Rated | 25 | Fire Protection, Stock, Or Small Fish Pond | 1973 |
| Liken Family Farm Dam | Low | Not Rated | 25 | Fire Protection, Stock, Or Small Fish Pond | 1986 |
| Three Mile Creek Watershed Site 14-m | Low | Not Rated | 25 | Other | 1976 |
| Twelve Mile Creek Watershed Site 68-2 | Low | Not Rated | 25 | Fire Protection, Stock, Or Small Fish Pond | 1979 |
| East Fork Grand River Watershed Site A-35 | Low | Not Rated | 25 | Flood Risk Reduction | 2011 |
| Wasteney Dam | Low | Not Rated | 24 | Fire Protection, Stock, Or Small Fish Pond | 1977 |
| Hubbard Dam | Low | Not Rated | 24 | Recreation | 1971 |
| East Fork Grand River Watershed Site A-40 | Low | Not Rated | 24 | Flood Risk Reduction | 2005 |
| East Fork Grand River Watershed Site A-37 | Low | Not Rated | 24 | Flood Risk Reduction | 2005 |
| Three Mile Creek Watershed Site U-5-a | Low | Not Rated | 24 | Fire Protection, Stock, Or Small Fish Pond | 1980 |
| Twelve Mile Creek Watershed Site 71 | Low | Not Rated | 23 | Fire Protection, Stock, Or Small Fish Pond | 1993 |
| Twelve Mile Creek Watershed Site 72-2 | Low | Not Rated | 23 | Fire Protection, Stock, Or Small Fish Pond | 1979 |
| East Fork Grand River Watershed Site A-53 | Low | Not Rated | 23 | Flood Risk Reduction | 2008 |
| Three Mile Creek Watershed Site 14-p | Low | Not Rated | 23 | Fire Protection, Stock, Or Small Fish Pond | 1976 |
| Three Mile Creek Watershed Site U-3 | Low | Not Rated | 23 | Fire Protection, Stock, Or Small Fish Pond | 1980 |
| Dory Dam | Low | Not Rated | 22 | Fire Protection, Stock, Or Small Fish Pond | 1985 |
| Hiatt Dam | Low | Not Rated | 22 | Fire Protection, Stock, Or Small Fish Pond | 1968 |
| East Fork Grand River Watershed Site A-36 | Low | Not Rated | 22 | Grade Stabilization | 2001 |
| East Fork Grand River Watershed Site A-30 | Low | Not Rated | 22 | Flood Risk Reduction | 2005 |
| Twelve Mile Creek Watershed Site 77 | Low | Not Rated | 22 | Fire Protection, Stock, Or Small Fish Pond | 1979 |
| East Fork Grand River Watershed Site A-55 | Low | Not Rated | 22 | Flood Risk Reduction | 2008 |
| Travis Dam | Low | Not Rated | 21 | Fire Protection, Stock, Or Small Fish Pond | 1967 |
| Sharp Dam | Low | Not Rated | 21 | Fire Protection, Stock, Or Small Fish Pond | 1980 |
| Maxwell Dam | Low | Not Rated | 21 | Fire Protection, Stock, Or Small Fish Pond | 1983 |
| East Fork Grand River Watershed Site A-31 | Low | Not Rated | 21 | Flood Risk Reduction | 2005 |
| Crestmor Golf Club Dam | Low | Not Rated | 20 | Recreation | 1994 |
| Cheers Dam | Low | Not Rated | 18 | Fire Protection, Stock, Or Small Fish Pond | 1970 |
| Hawk Lake Dam | Low | Not Rated | 18 | Water Supply | 1967 |
| Van Hall Dam | Low | Not Rated | 8 | Other | 1995 |