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 301–325 of 1,630
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Sparta New City Reservoir Dam Randolph County | 16 | 1952 | Significant | Not Available |
| Spaniel Lake Dam Will County | 12 | — | High | Not Available |
| South Warner Pond Dam Peoria County | 25 | 1957 | Low | Not Available |
| South Side Detention Basin Berm 3 Dam Coles County | 13 | 2011 | Low | Not Available |
| South Side Detention Basin Berm 2 Dam Coles County | 14 | 2011 | Low | Not Available |
| South Side Detention Basin Berm 1 Dam Coles County | 12 | 2011 | High | Not Available |
| South Mack Glass Pond Dam Warren County | 29 | 1974 | Low | Not Available |
| South Lake of The Coves Dam Cook County | 16 | 1969 | Low | Not Available |
| South Lake Dam McHenry County | 16 | 1965 | Low | Not Available |
| Southern Il Power South Fly Ash Pond Dam Williamson County | 29 | 1989 | Low | Not Available |
| Southern Il Power Fly Ash Disp Pond B-3 Dam Williamson County | 36 | 1986 | Low | Not Available |
| Solomon Lake Dam 1 De Witt County | 30 | 1967 | Low | Not Available |
| Smithton Sportsmans Club Lake Dam St. Clair County | 26 | 1957 | Low | Not Available |
| Smith Pond Dam Morgan County | 27 | 1968 | Low | Not Available |
| Smithland Locks and Dam Livingston County | 56 | 1980 | Significant | Not Available |
| Smith Lake Dam Jersey County | 37 | 1966 | Low | Not Available |
| Smith Lake Dam Peoria County | 47 | 1969 | Significant | Not Available |
| Small Timber Lake Dam Peoria County | 34 | 1957 | Low | Not Available |
| Smallpox Creek Dam Jo Daviess County | 60 | 1974 | High | Not Available |
| Slocum Lake Dam Lake County | 8 | 1983 | Low | Not Available |
| Sleepy Hollow Road Dam Kane County | 9 | — | Low | Not Available |
| Skylane Drive Dam DuPage County | 9 | 1998 | Low | Not Available |
| Sky Harbor Detention Area A Dam Will County | 7 | 2008 | High | Not Available |
| Skokie Lagoons Dredge Disposal Dam Cook County | 16 | 1990 | Low | Not Available |
| Six Pond Dam 1 Montgomery County | 25 | 1961 | Low | Not Available |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.