Dams in Harrison County, Iowa
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 Rated | 62 | Fire Protection, Stock, Or Small Fish Pond | 1965 |
| Mill Picayune Watershed Site M-2-1 | Low | Not Rated | 61 | Fire Protection, Stock, Or Small Fish Pond | 1967 |
| Rager Dam | Low | Not Rated | 58 | Flood Risk Reduction | 2011 |
| Weatherly/haight Dam | Low | Not Rated | 57 | Fire Protection, Stock, Or Small Fish Pond | 1967 |
| South Magnolia Watershed Site 1 | Low | Not Rated | 57 | Fire Protection, Stock, Or Small Fish Pond | 1958 |
| Schwertley Dam | Low | Not Rated | 55 | Fire Protection, Stock, Or Small Fish Pond | 1959 |
| Olsen Dam | Low | Not Rated | 52 | Fire Protection, Stock, Or Small Fish Pond | 1961 |
| Mosquito Of Harrison Watershed Site 5-1 | Low | Not Rated | 52 | Fire Protection, Stock, Or Small Fish Pond | 1985 |
| Mill Picayune Watershed Site P-39-1 | Low | Not Rated | 51 | Fire Protection, Stock, Or Small Fish Pond | 1989 |
| Mill Picayune Watershed Site S-10-1 | Low | Not Rated | 51 | Fire Protection, Stock, Or Small Fish Pond | 1962 |
| Mosquito Of Harrison Watershed Site 7-1 | Low | Not Rated | 50 | Fire Protection, Stock, Or Small Fish Pond | 1993 |
| Kasparbauer | Low | Not Rated | 49 | Flood Risk Reduction | 2012 |
| Johnson (oscar) Dam | Low | Not Rated | 49 | Flood Risk Reduction | 2011 |
| Mill Picayune Watershed Site S-10-2 | Low | Not Rated | 49 | Fire Protection, Stock, Or Small Fish Pond | 1965 |
| Schaben Dam | Low | Not Rated | 48 | Fire Protection, Stock, Or Small Fish Pond | 1970 |
| Mill Picayune Watershed Site M-3-1 | Low | Not Rated | 48 | Fire Protection, Stock, Or Small Fish Pond | 1964 |
| Mill Picayune Watershed Site S-8-2 | Low | Not Rated | 48 | Fire Protection, Stock, Or Small Fish Pond | 1984 |
| Spencer Dam | Low | Not Rated | 47 | Fire Protection, Stock, Or Small Fish Pond | 2007 |
| Mosquito Creek Watershed Site 6-5 | Low | Not Rated | 47 | Fire Protection, Stock, Or Small Fish Pond | 1979 |
| Harmony Creek Watershed Site 4 | Low | Not Rated | 46 | Fire Protection, Stock, Or Small Fish Pond | 1958 |
| Mosquito Creek Watershed Site 6-1 | Low | Not Rated | 46 | Fire Protection, Stock, Or Small Fish Pond | 1979 |
| Harmony Creek Watershed Site 6 | Low | Not Rated | 45 | Fire Protection, Stock, Or Small Fish Pond | 1958 |
| Mosquito Of Harrison Watershed Site 5-4 | Low | Not Rated | 45 | Fire Protection, Stock, Or Small Fish Pond | 1988 |
| Mill Picayune Watershed Site P-33-1 | Low | Not Rated | 45 | Fire Protection, Stock, Or Small Fish Pond | 1965 |
| Mill Picayune Watershed Site S-10-7 | Low | Not Rated | 45 | Fire Protection, Stock, Or Small Fish Pond | 1962 |
| Mill Picayune Watershed Site M-2-2 | Low | Not Rated | 45 | Fire Protection, Stock, Or Small Fish Pond | 1967 |
| South Magnolia Watershed Site Z | Low | Not Rated | 44 | Fire Protection, Stock, Or Small Fish Pond | 1958 |
| Ramsey Dam | Low | Not Rated | 43 | Grade Stabilization | 2000 |
| Harmony Creek Watershed Site 1 | Low | Not Rated | 43 | Fire Protection, Stock, Or Small Fish Pond | 1958 |
| Mosquito Of Harrison Watershed Site 5-2 | Low | Not Rated | 43 | Fire Protection, Stock, Or Small Fish Pond | 1988 |
| Mc Intosh Dam | Low | Not Rated | 42 | Fire Protection, Stock, Or Small Fish Pond | 1977 |
| Burkhart Dam | Low | Not Rated | 42 | Flood Risk Reduction | 2010 |
| Harper Century Farm Dam | Low | Not Rated | 42 | Flood Risk Reduction | 2011 |
| Mill Picayune Watershed Site N-3 | Low | Not Rated | 42 | Fire Protection, Stock, Or Small Fish Pond | 1973 |
| Mill Picayune Watershed Site D-3 | Low | Not Rated | 42 | Fire Protection, Stock, Or Small Fish Pond | 1968 |
| Brummer Dam | Low | Not Rated | 41 | Fire Protection, Stock, Or Small Fish Pond | 1945 |
| Collier Dam | Low | Not Rated | 41 | Fire Protection, Stock, Or Small Fish Pond | 1974 |
| Cleveland Dam | Low | Not Rated | 41 | Flood Risk Reduction | 2011 |
| Winner Dam | Low | Not Rated | 41 | Flood Risk Reduction | 2011 |
| Koski Dam | Low | Not Rated | 41 | Flood Risk Reduction | 2011 |
| Harmony Creek Watershed Site 7 | Low | Not Rated | 40 | Fire Protection, Stock, Or Small Fish Pond | 1958 |
| Mosquito Of Harrison Watershed Site 5-3 | Low | Not Rated | 40 | Fire Protection, Stock, Or Small Fish Pond | 1988 |
| Mosquito Of Harrison Watershed Site 7-4 | Low | Not Rated | 40 | Fire Protection, Stock, Or Small Fish Pond | 1993 |
| Mosquito Creek Watershed Site 6-2 | Low | Not Rated | 40 | Fire Protection, Stock, Or Small Fish Pond | 1979 |
| Mill Picayune Watershed Site N-13-2 | Low | Not Rated | 40 | Fire Protection, Stock, Or Small Fish Pond | 1961 |
| Straight Dam | Low | Not Rated | 39 | Flood Risk Reduction | 2011 |
| Roy/kemmish Dam | Low | Not Rated | 39 | Fire Protection, Stock, Or Small Fish Pond | 1960 |
| Mill Picayune Watershed Site M-2-3 | Low | Not Rated | 39 | Fire Protection, Stock, Or Small Fish Pond | 1967 |
| Nowak Dam | Low | Not Rated | 38 | Grade Stabilization | 2001 |
| Mosquito Creek Watershed Site 11-2-2 | Low | Not Rated | 38 | Fire Protection, Stock, Or Small Fish Pond | 1979 |
| Iowa Noname18 | Low | Not Rated | 37 | Fire Protection, Stock, Or Small Fish Pond | 1961 |
| Kline/peterson Dam | Low | Not Rated | 37 | Fire Protection, Stock, Or Small Fish Pond | 1966 |
| South Magnolia Watershed Site 5 | Low | Not Rated | 37 | Fire Protection, Stock, Or Small Fish Pond | 1958 |
| Mill Picayune Watershed Site M-6-1 | Low | Not Rated | 37 | Fire Protection, Stock, Or Small Fish Pond | 1992 |
| Elias Dam | Low | Not Rated | 36 | Fire Protection, Stock, Or Small Fish Pond | 1955 |
| Cohrs Dam | Low | Not Rated | 36 | Flood Risk Reduction | 2011 |
| Mosquito Creek Watershed Site 13-1 | Low | Not Rated | 36 | Fire Protection, Stock, Or Small Fish Pond | 1968 |
| Mill Picayune Watershed Site I-1 | Low | Not Rated | 35 | Fire Protection, Stock, Or Small Fish Pond | 1984 |
| Buss Dam | Low | Not Rated | 34 | Fire Protection, Stock, Or Small Fish Pond | 1996 |
| Greenwood Dam | Low | Not Rated | 34 | Fire Protection, Stock, Or Small Fish Pond | 1996 |
| Smith (steve) Dam | Low | Not Rated | 34 | Flood Risk Reduction | 2011 |
| South Magnolia Watershed Site 4 | Low | Not Rated | 34 | Fire Protection, Stock, Or Small Fish Pond | 1958 |
| Mill Picayune Watershed Site G-1 | Low | Not Rated | 34 | Fire Protection, Stock, Or Small Fish Pond | 1986 |
| Mill Picayune Watershed Site S-8-3 | Low | Not Rated | 34 | Fire Protection, Stock, Or Small Fish Pond | 1965 |
| Mill Picayune Watershed Site S-32-1 | Low | Not Rated | 34 | Fire Protection, Stock, Or Small Fish Pond | 1992 |
| Bloom Dam | Low | Not Rated | 33 | Fire Protection, Stock, Or Small Fish Pond | 2006 |
| Mill Picayune Watershed Site E-1 | Low | Not Rated | 33 | Fire Protection, Stock, Or Small Fish Pond | 1969 |
| Mosquito Of Harrison Wtrshd Site11-1-3a | Low | Not Rated | 32 | Fire Protection, Stock, Or Small Fish Pond | 1996 |
| Mill Picayune Watershed Site S-1 | Low | Not Rated | 32 | Fire Protection, Stock, Or Small Fish Pond | 1994 |
| Mc Clendon Dam | Low | Not Rated | 31 | Fire Protection, Stock, Or Small Fish Pond | 2000 |
| Heistand/erlewine Dam | Low | Not Rated | 31 | Fire Protection, Stock, Or Small Fish Pond | 1968 |
| Iowa Noname70 | Low | Not Rated | 31 | Debris Control | 1976 |
| Willow Lake Dam | Low | Not Rated | 31 | Debris Control | 1976 |
| Mosquito Of Harrison B | Low | Not Rated | 31 | Fire Protection, Stock, Or Small Fish Pond | 1987 |
| Mill Picayune Watershed Site A-2 | Low | Not Rated | 31 | Fire Protection, Stock, Or Small Fish Pond | 1966 |
| Mill Picayune Watershed Site N-13-1 | Low | Not Rated | 31 | Fire Protection, Stock, Or Small Fish Pond | 1965 |
| Mill Picayune Watershed Site S-36-1 | Low | Not Rated | 31 | Fire Protection, Stock, Or Small Fish Pond | 1992 |
| Ganzhorn Dam | Low | Not Rated | 30 | Fire Protection, Stock, Or Small Fish Pond | 1970 |
| Grote Dam | Low | Not Rated | 30 | Fire Protection, Stock, Or Small Fish Pond | 1974 |
| Buss Dam | Low | Not Rated | 30 | Flood Risk Reduction | 2011 |
| Iowa Noname21 | Low | Not Rated | 30 | Fire Protection, Stock, Or Small Fish Pond | 1965 |
| Mill Picayune Watershed Site S-8-1 | Low | Not Rated | 30 | Fire Protection, Stock, Or Small Fish Pond | 1985 |
| Grap Dam | Low | Not Rated | 29 | Flood Risk Reduction | 2011 |
| Cunard Dam | Low | Not Rated | 29 | Flood Risk Reduction | 2011 |
| Mill Picayune Watershed Site S-4 | Low | Not Rated | 29 | Other | 1991 |
| Mosquito Of Harrison Watershed Site 7-2 | Low | Not Rated | 29 | Fire Protection, Stock, Or Small Fish Pond | 1992 |
| Mill Picayune Watershed Site P-41-1 | Low | Not Rated | 29 | Fire Protection, Stock, Or Small Fish Pond | 1984 |
| Mill Picayune Watershed Site P-4-1 | Low | Not Rated | 29 | Fire Protection, Stock, Or Small Fish Pond | 1994 |
| South Magnolia Watershed Site 3 | Low | Not Rated | 28 | Fire Protection, Stock, Or Small Fish Pond | 1958 |
| Andersen Dam | Low | Not Rated | 27 | Grade Stabilization | 2001 |
| Erickson Dam | Low | Not Rated | 27 | Flood Risk Reduction | 2003 |
| Mosquito Of Harrison Watershed Site C-1 | Low | Not Rated | 27 | Fire Protection, Stock, Or Small Fish Pond | 1990 |
| Stephany Dam | Low | Not Rated | 26 | Fire Protection, Stock, Or Small Fish Pond | 1945 |
| Heistand/swain Dam | Low | Not Rated | 26 | Fire Protection, Stock, Or Small Fish Pond | 1968 |
| Gochenour Dam | Low | Not Rated | 25 | Fire Protection, Stock, Or Small Fish Pond | 2003 |
| Harmony Creek Watershed Site 5 | Low | Not Rated | 23 | Fire Protection, Stock, Or Small Fish Pond | 1958 |
| Little Sioux River Bedgrade Control | Low | Not Rated | 8 | Grade Stabilization | 1985 |
| Little Sioux Dam | Low | Not Rated | 7 | Other | 1963 |