100Total Dams
1High Hazard
1Significant
Dam Safety in Harrison County, Iowa
Harrison County has 100 dams tracked in the National Inventory of Dams. Of these, 1 are classified as high hazard — meaning failure would probably cause loss of human life. Another 1 carry a significant hazard classification.
The average dam in Harrison County is 45 years old. The most common purpose is fire protection, stock, or small fish pond. The tallest dam is Harrison County Roadgrade Dam 18-79-43 at 66 ft.
Explore more: Oldest dams in Iowa · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Mill Picayune Watershed Site B-3 | High | Satisfactory | 38 | Flood Risk Reduction | 1962 |
| Harrison County Roadgrade Dam 18-79-43 | Significant | Fair | 66 | Other | 1959 |
| Boustead/coenen/pryor Dam | Low | Not assessed | 62 | Fire Protection, Stock, Or Small Fish Pond | 1965 |
| Mill Picayune Watershed Site M-2-1 | Low | Not assessed | 61 | Fire Protection, Stock, Or Small Fish Pond | 1967 |
| Rager Dam | Low | Not assessed | 58 | Flood Risk Reduction | 2011 |
| Weatherly/haight Dam | Low | Not assessed | 57 | Fire Protection, Stock, Or Small Fish Pond | 1967 |
| South Magnolia Watershed Site 1 | Low | Not assessed | 57 | Fire Protection, Stock, Or Small Fish Pond | 1958 |
| Schwertley Dam | Low | Not assessed | 55 | Fire Protection, Stock, Or Small Fish Pond | 1959 |
| Olsen Dam | Low | Not assessed | 52 | Fire Protection, Stock, Or Small Fish Pond | 1961 |
| Mosquito of Harrison Watershed Site 5-1 | Low | Not assessed | 52 | Fire Protection, Stock, Or Small Fish Pond | 1985 |
| Mill Picayune Watershed Site P-39-1 | Low | Not assessed | 51 | Fire Protection, Stock, Or Small Fish Pond | 1989 |
| Mill Picayune Watershed Site S-10-1 | Low | Not assessed | 51 | Fire Protection, Stock, Or Small Fish Pond | 1962 |
| Mosquito of Harrison Watershed Site 7-1 | Low | Not assessed | 50 | Fire Protection, Stock, Or Small Fish Pond | 1993 |
| Kasparbauer | Low | Not assessed | 49 | Flood Risk Reduction | 2012 |
| Johnson (oscar) Dam | Low | Not assessed | 49 | Flood Risk Reduction | 2011 |
| Mill Picayune Watershed Site S-10-2 | Low | Not assessed | 49 | Fire Protection, Stock, Or Small Fish Pond | 1965 |
| Schaben Dam | Low | Not assessed | 48 | Fire Protection, Stock, Or Small Fish Pond | 1970 |
| Mill Picayune Watershed Site M-3-1 | Low | Not assessed | 48 | Fire Protection, Stock, Or Small Fish Pond | 1964 |
| Mill Picayune Watershed Site S-8-2 | Low | Not assessed | 48 | Fire Protection, Stock, Or Small Fish Pond | 1984 |
| Spencer Dam | Low | Not assessed | 47 | Fire Protection, Stock, Or Small Fish Pond | 2007 |
| Mosquito Creek Watershed Site 6-5 | Low | Not assessed | 47 | Fire Protection, Stock, Or Small Fish Pond | 1979 |
| Harmony Creek Watershed Site 4 | Low | Not assessed | 46 | Fire Protection, Stock, Or Small Fish Pond | 1958 |
| Mosquito Creek Watershed Site 6-1 | Low | Not assessed | 46 | Fire Protection, Stock, Or Small Fish Pond | 1979 |
| Harmony Creek Watershed Site 6 | Low | Not assessed | 45 | Fire Protection, Stock, Or Small Fish Pond | 1958 |
| Mosquito of Harrison Watershed Site 5-4 | Low | Not assessed | 45 | Fire Protection, Stock, Or Small Fish Pond | 1988 |
| Mill Picayune Watershed Site P-33-1 | Low | Not assessed | 45 | Fire Protection, Stock, Or Small Fish Pond | 1965 |
| Mill Picayune Watershed Site S-10-7 | Low | Not assessed | 45 | Fire Protection, Stock, Or Small Fish Pond | 1962 |
| Mill Picayune Watershed Site M-2-2 | Low | Not assessed | 45 | Fire Protection, Stock, Or Small Fish Pond | 1967 |
| South Magnolia Watershed Site Z | Low | Not assessed | 44 | Fire Protection, Stock, Or Small Fish Pond | 1958 |
| Ramsey Dam | Low | Not assessed | 43 | Grade Stabilization | 2000 |
| Harmony Creek Watershed Site 1 | Low | Not assessed | 43 | Fire Protection, Stock, Or Small Fish Pond | 1958 |
| Mosquito of Harrison Watershed Site 5-2 | Low | Not assessed | 43 | Fire Protection, Stock, Or Small Fish Pond | 1988 |
| Mc Intosh Dam | Low | Not assessed | 42 | Fire Protection, Stock, Or Small Fish Pond | 1977 |
| Burkhart Dam | Low | Not assessed | 42 | Flood Risk Reduction | 2010 |
| Harper Century Farm Dam | Low | Not assessed | 42 | Flood Risk Reduction | 2011 |
| Mill Picayune Watershed Site N-3 | Low | Not assessed | 42 | Fire Protection, Stock, Or Small Fish Pond | 1973 |
| Mill Picayune Watershed Site D-3 | Low | Not assessed | 42 | Fire Protection, Stock, Or Small Fish Pond | 1968 |
| Brummer Dam | Low | Not assessed | 41 | Fire Protection, Stock, Or Small Fish Pond | 1945 |
| Collier Dam | Low | Not assessed | 41 | Fire Protection, Stock, Or Small Fish Pond | 1974 |
| Cleveland Dam | Low | Not assessed | 41 | Flood Risk Reduction | 2011 |
| Winner Dam | Low | Not assessed | 41 | Flood Risk Reduction | 2011 |
| Koski Dam | Low | Not assessed | 41 | Flood Risk Reduction | 2011 |
| Harmony Creek Watershed Site 7 | Low | Not assessed | 40 | Fire Protection, Stock, Or Small Fish Pond | 1958 |
| Mosquito of Harrison Watershed Site 5-3 | Low | Not assessed | 40 | Fire Protection, Stock, Or Small Fish Pond | 1988 |
| Mosquito of Harrison Watershed Site 7-4 | Low | Not assessed | 40 | Fire Protection, Stock, Or Small Fish Pond | 1993 |
| Mosquito Creek Watershed Site 6-2 | Low | Not assessed | 40 | Fire Protection, Stock, Or Small Fish Pond | 1979 |
| Mill Picayune Watershed Site N-13-2 | Low | Not assessed | 40 | Fire Protection, Stock, Or Small Fish Pond | 1961 |
| Straight Dam | Low | Not assessed | 39 | Flood Risk Reduction | 2011 |
| Roy/kemmish Dam | Low | Not assessed | 39 | Fire Protection, Stock, Or Small Fish Pond | 1960 |
| Mill Picayune Watershed Site M-2-3 | Low | Not assessed | 39 | Fire Protection, Stock, Or Small Fish Pond | 1967 |
| Nowak Dam | Low | Not assessed | 38 | Grade Stabilization | 2001 |
| Mosquito Creek Watershed Site 11-2-2 | Low | Not assessed | 38 | Fire Protection, Stock, Or Small Fish Pond | 1979 |
| Iowa Noname18 | Low | Not assessed | 37 | Fire Protection, Stock, Or Small Fish Pond | 1961 |
| Kline/peterson Dam | Low | Not assessed | 37 | Fire Protection, Stock, Or Small Fish Pond | 1966 |
| South Magnolia Watershed Site 5 | Low | Not assessed | 37 | Fire Protection, Stock, Or Small Fish Pond | 1958 |
| Mill Picayune Watershed Site M-6-1 | Low | Not assessed | 37 | Fire Protection, Stock, Or Small Fish Pond | 1992 |
| Elias Dam | Low | Not assessed | 36 | Fire Protection, Stock, Or Small Fish Pond | 1955 |
| Cohrs Dam | Low | Not assessed | 36 | Flood Risk Reduction | 2011 |
| Mosquito Creek Watershed Site 13-1 | Low | Not assessed | 36 | Fire Protection, Stock, Or Small Fish Pond | 1968 |
| Mill Picayune Watershed Site I-1 | Low | Not assessed | 35 | Fire Protection, Stock, Or Small Fish Pond | 1984 |
| Buss Dam | Low | Not assessed | 34 | Fire Protection, Stock, Or Small Fish Pond | 1996 |
| Greenwood Dam | Low | Not assessed | 34 | Fire Protection, Stock, Or Small Fish Pond | 1996 |
| Smith (steve) Dam | Low | Not assessed | 34 | Flood Risk Reduction | 2011 |
| South Magnolia Watershed Site 4 | Low | Not assessed | 34 | Fire Protection, Stock, Or Small Fish Pond | 1958 |
| Mill Picayune Watershed Site G-1 | Low | Not assessed | 34 | Fire Protection, Stock, Or Small Fish Pond | 1986 |
| Mill Picayune Watershed Site S-8-3 | Low | Not assessed | 34 | Fire Protection, Stock, Or Small Fish Pond | 1965 |
| Mill Picayune Watershed Site S-32-1 | Low | Not assessed | 34 | Fire Protection, Stock, Or Small Fish Pond | 1992 |
| Bloom Dam | Low | Not assessed | 33 | Fire Protection, Stock, Or Small Fish Pond | 2006 |
| Mill Picayune Watershed Site E-1 | Low | Not assessed | 33 | Fire Protection, Stock, Or Small Fish Pond | 1969 |
| Mosquito of Harrison Wtrshd Site11-1-3a | Low | Not assessed | 32 | Fire Protection, Stock, Or Small Fish Pond | 1996 |
| Mill Picayune Watershed Site S-1 | Low | Not assessed | 32 | Fire Protection, Stock, Or Small Fish Pond | 1994 |
| Mc Clendon Dam | Low | Not assessed | 31 | Fire Protection, Stock, Or Small Fish Pond | 2000 |
| Heistand/erlewine Dam | Low | Not assessed | 31 | Fire Protection, Stock, Or Small Fish Pond | 1968 |
| Iowa Noname70 | Low | Not assessed | 31 | Debris Control | 1976 |
| Willow Lake Dam | Low | Not assessed | 31 | Debris Control | 1976 |
| Mosquito of Harrison B | Low | Not assessed | 31 | Fire Protection, Stock, Or Small Fish Pond | 1987 |
| Mill Picayune Watershed Site A-2 | Low | Not assessed | 31 | Fire Protection, Stock, Or Small Fish Pond | 1966 |
| Mill Picayune Watershed Site N-13-1 | Low | Not assessed | 31 | Fire Protection, Stock, Or Small Fish Pond | 1965 |
| Mill Picayune Watershed Site S-36-1 | Low | Not assessed | 31 | Fire Protection, Stock, Or Small Fish Pond | 1992 |
| Ganzhorn Dam | Low | Not assessed | 30 | Fire Protection, Stock, Or Small Fish Pond | 1970 |
| Grote Dam | Low | Not assessed | 30 | Fire Protection, Stock, Or Small Fish Pond | 1974 |
| Buss Dam | Low | Not assessed | 30 | Flood Risk Reduction | 2011 |
| Iowa Noname21 | Low | Not assessed | 30 | Fire Protection, Stock, Or Small Fish Pond | 1965 |
| Mill Picayune Watershed Site S-8-1 | Low | Not assessed | 30 | Fire Protection, Stock, Or Small Fish Pond | 1985 |
| Grap Dam | Low | Not assessed | 29 | Flood Risk Reduction | 2011 |
| Cunard Dam | Low | Not assessed | 29 | Flood Risk Reduction | 2011 |
| Mill Picayune Watershed Site S-4 | Low | Not assessed | 29 | Other | 1991 |
| Mosquito of Harrison Watershed Site 7-2 | Low | Not assessed | 29 | Fire Protection, Stock, Or Small Fish Pond | 1992 |
| Mill Picayune Watershed Site P-41-1 | Low | Not assessed | 29 | Fire Protection, Stock, Or Small Fish Pond | 1984 |
| Mill Picayune Watershed Site P-4-1 | Low | Not assessed | 29 | Fire Protection, Stock, Or Small Fish Pond | 1994 |
| South Magnolia Watershed Site 3 | Low | Not assessed | 28 | Fire Protection, Stock, Or Small Fish Pond | 1958 |
| Andersen Dam | Low | Not assessed | 27 | Grade Stabilization | 2001 |
| Erickson Dam | Low | Not assessed | 27 | Flood Risk Reduction | 2003 |
| Mosquito of Harrison Watershed Site C-1 | Low | Not assessed | 27 | Fire Protection, Stock, Or Small Fish Pond | 1990 |
| Stephany Dam | Low | Not assessed | 26 | Fire Protection, Stock, Or Small Fish Pond | 1945 |
| Heistand/swain Dam | Low | Not assessed | 26 | Fire Protection, Stock, Or Small Fish Pond | 1968 |
| Gochenour Dam | Low | Not assessed | 25 | Fire Protection, Stock, Or Small Fish Pond | 2003 |
| Harmony Creek Watershed Site 5 | Low | Not assessed | 23 | Fire Protection, Stock, Or Small Fish Pond | 1958 |
| Little Sioux River Bedgrade Control | Low | Not assessed | 8 | Grade Stabilization | 1985 |
| Little Sioux Dam | Low | Not assessed | 7 | Other | 1963 |