21Total Dams
4High Hazard
5Significant
Dam Safety in McHenry County, Illinois
McHenry County has 21 dams tracked in the National Inventory of Dams. Of these, 4 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 McHenry County is 64 years old. The most common purpose is recreation. The tallest dam is Lake in the Hills Dam 1 at 40 ft.
Explore more: Oldest dams in Illinois · Tallest dams · High risk dams · Largest reservoirs
| Dam | Hazard | Condition | Height (ft) | Purpose | Year |
|---|---|---|---|---|---|
| Lake in the Hills Dam 1 | High | Not assessed | 40 | Recreation | 1926 |
| Wonder Lake Dam | High | Not assessed | 27 | Recreation | 1929 |
| High Hill Farms Dam | High | Not assessed | 23 | Flood Risk Reduction | 1977 |
| Wonder Lake Sediment Dewatering Facility Dam | High | Not assessed | 22 | Other | 2014 |
| Kazimer Lake Dam | Significant | Not assessed | 15 | Recreation | 1965 |
| Lake in the Hills 2 Dam | Significant | Not assessed | 15 | Other | 1947 |
| Algonquin Dam | Significant | Not assessed | 9 | Flood Risk Reduction | 1947 |
| Brookdale Dam | Significant | Not assessed | 8 | Recreation | |
| Stratton Lock and Dam | Significant | Not assessed | 7 | Flood Risk Reduction | 1939 |
| Silver Lake Dam | Low | Not assessed | 23 | Recreation | 1929 |
| Kingsley Lake Dam | Low | Not assessed | 22 | Recreation | 1972 |
| South Lake Dam | Low | Not assessed | 16 | Recreation | 1965 |
| Eddy Lake Dam | Low | Not assessed | 14 | Recreation | 1965 |
| Woodscreek Detention Dam | Low | Not assessed | 13 | Flood Risk Reduction | 1991 |
| Island Lake Dam | Low | Not assessed | 12 | Recreation | 1940 |
| Wold Lake Dam | Low | Not assessed | 11 | Recreation | 1965 |
| Lake in the Hills 3 Dam | Low | Not assessed | 10 | Recreation | 1940 |
| Thunderbird Lake 2 Dam | Low | Not assessed | 10 | Recreation | 1965 |
| Thunderbird Lake 1 Dam | Low | Not assessed | 7 | Recreation | 1965 |
| Yellow Head Marsh Dam | Low | Not assessed | 7 | Other | 1990 |
| Black Tern Marsh Dam | Low | Not assessed | 7 | Recreation | 1992 |