30Total Dams
6High Hazard
10Significant
Dam Safety in Williamson County, Illinois
Williamson County has 30 dams tracked in the National Inventory of Dams. Of these, 6 are classified as high hazard — meaning failure would probably cause loss of human life. Another 10 carry a significant hazard classification. Currently, 2 dams have a condition assessment of poor or unsatisfactory.
The average dam in Williamson County is 67 years old. The most common purpose is recreation. The tallest dam is Devil`s Kitchen Dam at 121 ft.
Explore more: Oldest dams in Illinois · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Devil`s Kitchen Dam | High | Satisfactory | 121 | Fish and Wildlife Pond | 1959 |
| Williamson Energy/pond Creek Mine/refuse Disposal Facility | High | Not assessed | 88 | Other | |
| Little Grassy Dam | High | Fair | 88 | Fish and Wildlife Pond | 1942 |
| Springfield Coal/orient 4/east Slurry Imp | High | Not assessed | 66 | Other | 1985 |
| Crab Orchard Dam | High | Fair | 65 | Fish and Wildlife Pond | 1939 |
| Lake of Egypt Dam | High | Not assessed | 55 | Other | 1962 |
| Freeman United/ /fresh Water Lake Dam | Significant | Not assessed | 30 | Other | 1964 |
| Herrin Reservoir 2 Dam | Significant | Not assessed | 27 | Recreation | 1926 |
| Belford Lake Dam | Significant | Not assessed | 26 | Fire Protection, Stock, Or Small Fish Pond | 1966 |
| Marion Prison Lake Dam | Significant | Not assessed | 26 | Water Supply | 1991 |
| Marion Reservoir Dam | Significant | Not assessed | 25 | Water Supply | 1971 |
| Zeigler Coal Lake 5 Dam | Significant | Not assessed | 18 | Other | 1963 |
| Arrowhead Lake Dam | Significant | Not assessed | 16 | Recreation | 1963 |
| Johnston City Lake Dam | Significant | Not assessed | 14 | Water Supply | 1921 |
| Johnston City Sewage Lagoon Dam | Significant | Not assessed | 12 | Other | 1963 |
| Herrin Reservoir 1 Dam | Significant | Not assessed | 6 | Recreation | 1915 |
| Springfield Coal/orient 4/aux Slurry Pond | Low | Not assessed | 47 | Other | 1986 |
| Southern Il Power Fly Ash Disp Pond B-3 Dam | Low | Not assessed | 36 | Debris Control | 1986 |
| Southern Il Power South Fly Ash Pond Dam | Low | Not assessed | 29 | Debris Control | 1989 |
| Visitor Center Dam | Low | Satisfactory | 26 | Fish and Wildlife Pond | 2009 |
| Dam A-41 | Low | Poor | 24 | Fish and Wildlife Pond | 1965 |
| Pleasant Valley Lake Dam | Low | Not assessed | 21 | Recreation | 1958 |
| Martel Lake Dam | Low | Not assessed | 20 | Recreation | 1974 |
| Bleyar Lake Dam | Low | Not assessed | 20 | Fire Protection, Stock, Or Small Fish Pond | 1974 |
| Madison Lake Dam | Low | Not assessed | 19 | Recreation | 1919 |
| Marion Country Club Lake Dam | Low | Not assessed | 17 | Recreation | 1914 |
| Knights of Pythias Lake Dam | Low | Not assessed | 14 | Recreation | 1928 |
| Durst Lake Dam | Low | Not assessed | 13 | Irrigation | 1942 |
| A16 Pond Dam | Low | Unsatisfactory | 13 | Fish and Wildlife Pond | 1970 |
| Teal Lake Dam | Low | Not assessed | 12 | Recreation | 1966 |