Deepest lakes & reservoirs in Western Illinois by maximum depth (ft)
The estimated greatest depth of the water in a lake can be measured at the lake’s normal elevation. If the water volume and surface area of a lake are known, an estimate of the lake’s average depth can be calculated:Water volume ÷ Surface Area = Average Depth
Example: 1,000,000 acre-feet ÷ 20,000 acres = 50 feet average depth.
You can find many of the the world’s deepest lakes on LakeLubbers. If you sort the list, you will find the (maximum depth of) the shallowest lakes in our database. Note: For some lakes, lake depth data is unknown, so this table may display fewer lakes than the total 6 articles we have published for Western Illinois lakes.
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Below are lakes within USA > US Midwest Region > Illinois > Western Illinois > Compared by maximum depth in feet. This list does not represent all lakes in Western Illinois, only the 6 Western Illinois lake articles we have published on the LakeLubbers website.
Lake name  |
Max depth in feet |
Lake description |
|---|---|---|
| Lake Thunderbird, IL (Illinois, Northern Illinois, US Midwest Region, USA, Western Illinois) |
66 ft | Nestled in the rural Illinois woods, Lake Thunderbird is set in Putnam County, the smallest county in Illinois. The lake, located on the border of the… |
| Fyre Lake, IL (Illinois, US Midwest Region, USA, Western Illinois) |
40 ft | A musical artist may have made Fire Lake famous, but he didn’t know about Fyre Lake! Located in the Western Region of Illinois a few miles south of th… |
| Little Swan Lake, IL (Illinois, US Midwest Region, USA, Western Illinois) |
36 ft | TEST – Little Swan Lake is a private community tucked away in the quiet atmosphere of rural Warren County in west central Illinois. Property owners a… |
| Lake Wee-Ma-Tuk (Illinois, US Midwest Region, USA, Western Illinois) |
25 ft | Lake Wee-Ma-Tuk, located southwest of Peoria, Illinois, is a shining example of thoughtful land restoration. The 154-acre private lake is part of an u… |