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 1426–1450 of 1,630
| Dam Name | Height (ft) | Year | Hazard | Condition |
|---|---|---|---|---|
| Tampier Lake Dam Cook County | 9 | 1964 | Significant | Not Available |
| Taphorn Pond Dam Randolph County | 31 | 1967 | Low | Not Available |
| Tara Lake Dam Kane County | 23 | 1964 | Significant | Not Available |
| Taylor Lake Dam Knox County | 21 | 1966 | Low | Not Available |
| Taylor Lake Dam Peoria County | 36 | — | Low | Not Available |
| Teagle Lake Dam St. Clair County | 26 | 1968 | Low | Not Available |
| Teal Lake Dam Williamson County | 12 | 1966 | Low | Not Available |
| Techny Reservoir Dam Cook County | 11 | 1979 | Significant | Not Available |
| Techumseh Hardin County | 26 | 1976 | Low | Not Rated |
| Tedrick Lake Dam Jefferson County | 29 | 1999 | Low | Not Available |
| Temples Pond Dam Coles County | 32 | 1969 | Low | Not Available |
| Temporary Sangamon River Dam Sangamon County | 20 | — | Low | Not Available |
| Tessman Farm Pond Dam Edgar County | 29 | 1973 | Low | Not Available |
| The Grove Dam McLean County | 7 | 2011 | Low | Not Available |
| Theilen Pond Dam 1 Sangamon County | 21 | 1977 | Low | Not Available |
| Third Lake Dam Edgar County | 39 | 1961 | Significant | Not Available |
| Thirteen Club Dam Peoria County | 30 | — | Significant | Not Available |
| Thomas J. O'Brien Lock and Controlling Works Cook County | 37 | 1960 | High | Not Available |
| Thomas Lake Dam Hancock County | 25 | 1975 | Low | Not Available |
| Thompson Pond Dam Henry County | 21 | 1972 | Low | Not Available |
| Thorton Quarry Gap Dam Cook County | 116 | 2013 | High | Not Available |
| Threw Lake Dam Knox County | 43 | — | Low | Not Available |
| Thunderbird Lake 1 Dam McHenry County | 7 | 1965 | Low | Not Available |
| Thunderbird Lake 2 Dam McHenry County | 10 | 1965 | Low | Not Available |
| Thunderbird Lake Dam Jersey County | 28 | 1965 | Low | Not Available |
Data sourced from the National Inventory of Dams (NID). Hazard classification reflects potential consequences of failure, not the likelihood of failure.