Illinois Dams
1,630 dams tracked by the National Inventory of Dams
Total Dams
1,630
High Hazard
251
15.4%
Poor / Unsatisfactory
6
Average Age
61 yrs
Hazard Classification
High251 (15.4%)
Significant360 (22.1%)
Low1,008 (61.8%)
Condition Assessment
Satisfactory8 (0.5%)
Fair6 (0.4%)
Poor / Unsatisfactory6 (0.4%)
Not Rated1,610 (98.8%)
Federal
48
State
68
Local
286
Private
1,153
Tallest Dams
- Refuse Disposal Area175 ft
- Shelbyville Dam138 ft
- Duck Creek Station Dams123 ft
- Devil`s Kitchen Dam121 ft
- Macoupin Energy Refuse Disposal Area 6117 ft
High Hazard Dams
Poor Condition Dams
- Whoopie CatPoor
- Arsenal Power Poor
- Dam A-41Poor
- Lake Chautauqua Upper DamPoor
- Lake Chautauqua Lower DamPoor
All Dams in Illinois
Showing 976–1000 of 1,630
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Jones Lake Dam Macoupin County | 36 | 1970 | Significant | Not Available |
| Joliet West Side Wastewater Treatment Plant Dam Will County | 25 | — | Low | Not Available |
| Joliet Junior College Lake Dam Will County | 11 | 1980 | Significant | Not Available |
| John Surgeon Pond Dam Jersey County | 25 | 1970 | Low | Not Available |
| Johnston City Sewage Lagoon Dam Williamson County | 12 | 1963 | Significant | Not Available |
| Johnston City Lake Dam Williamson County | 14 | 1921 | Significant | Not Available |
| Johnson Sauk Trail Lake Dam Henry County | 38 | 1956 | Low | Not Available |
| Johnson Pond Dam 1 Montgomery County | 30 | 1966 | Low | Not Available |
| Johnson Lake Dam Wayne County | 20 | 2002 | Low | Not Available |
| Jerry F. Costello Lock and Dam Randolph County | 81 | 1974 | Significant | Not Available |
| Jennifer Creek Reservoir Dam Hancock County | 62 | 1971 | Low | Not Available |
| Jacoby Pond Dam 1 Macoupin County | 40 | 1975 | Low | Not Available |
| Jack Smith Pond Dam Jersey County | 26 | 1970 | Undetermined | Not Available |
| Izaak Walton Lake Dam Woodford County | 33 | 1971 | Low | Not Available |
| Island Lake Dam McHenry County | 12 | 1940 | Low | Not Available |
| Island Lake Dam Kane County | 35 | 1940 | Low | Not Available |
| Irwin Lake Dam Mercer County | 34 | 1965 | Low | Not Available |
| Irish Lake Dam McDonough County | 35 | 1937 | Low | Not Available |
| Ipava Settling Basin Dam Fulton County | 24 | 1978 | Low | Not Available |
| International Coal/Viper/Slurry Impoundment Logan County | 109 | 1984 | High | Not Available |
| International Coal/Viper/North Slurry Impoundment Dam Logan County | 105 | — | High | Not Available |
| International Coal/Viper/Freshwater Impoundment Logan County | 12 | 1982 | Low | Not Available |
| International Center South Dam Grundy County | 7 | 2004 | Significant | Not Available |
| Ingram Pond Dam Jersey County | 30 | 1967 | Low | Not Available |
| Inez Lake Dam St. Clair County | 23 | — | Significant | Not Available |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.