Illinois has 26 irrigation dams, of which 3 carry a high hazard classification. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area.
| # | Dam | County | Height (ft) | Hazard | Condition | Year |
|---|---|---|---|---|---|---|
| 1 | Pelikan-surgeon-shapanski | Jersey | 45 | Low | Not assessed | 1965 |
| 2 | Weaver Ridge Lake Dam | Peoria | 44 | Low | Not assessed | 1996 |
| 3 | Sunset Hills Lake 1 Dam | Tazewell | 42 | High | Not assessed | 1964 |
| 4 | Nugent-schpanski 6 Lake Dam | Jersey | 40 | Low | Not assessed | 1956 |
| 5 | Gahr Pond Dam 2 | Macoupin | 36 | Low | Not assessed | 1975 |
| 6 | Wildwood Lake Estates Dam | St. Clair | 35 | Significant | Not assessed | 1982 |
| 7 | Gold Hills Dam | McDonough | 33 | Low | Not assessed | 2001 |
| 8 | Gahr Pond Dam 1 | Macoupin | 32 | Low | Not assessed | 1976 |
| 9 | Nugent-schpanski 4 Lake Dam | Jersey | 31 | Low | Not assessed | 1954 |
| 10 | Nugent-shapanski 1 | Jersey | 30 | Low | Not assessed | 1954 |
| 11 | Nugent-shapanski 2 | Jersey | 30 | Low | Not assessed | 1953 |
| 12 | Nugent-shapanski 3 | Jersey | 28 | Low | Not assessed | 1955 |
| 13 | Gahr Pond Dam 3 | Macoupin | 28 | Low | Not assessed | 1975 |
| 14 | Dhom Lake Dam 1 | Jasper | 27 | Low | Not assessed | 1975 |
| 15 | Keeven Lake Dam | Monroe | 25 | Significant | Not assessed | 1998 |
| 16 | Matthews Pond 1 | Montgomery | 25 | Low | Not assessed | 1969 |
| 17 | Rising Spring Orchard Lake Dam | Pike | 25 | Low | Not assessed | 1956 |
| 18 | Finn's Lake Dam | Monroe | 23 | Significant | Not assessed | |
| 19 | Mathews Pond Dam 2 | Montgomery | 23 | Low | Not assessed | 1974 |
| 20 | Cortland Water Reclamation Facility Cell 1 Dam | DeKalb | 17 | Low | Not assessed | 2008 |
| 21 | Cortland Water Reclamation Facility Cell 2 Dam | DeKalb | 17 | Low | Not assessed | 2008 |
| 22 | Cortland Water Reclamation Facility Cell 4 Dam | DeKalb | 17 | High | Not assessed | 2008 |
| 23 | Cortland Water Reclamation Facility Cell 3 Dam | DeKalb | 17 | High | Not assessed | 2008 |
| 24 | Hawthorn Woods Country Club Wwtp Dam | Lake | 17 | Low | Not assessed | 2006 |
| 25 | Durst Lake Dam | Williamson | 13 | Low | Not assessed | 1942 |
| 26 | Krajec Lake Dam | Edwards | 11 | Low | Not assessed | 1950 |