Lakes / Illinois / Monroe County / Waterloo New Reservoir
Waterloo New Reservoir, Illinois
35.09 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
38.31 degrees N, 90.17 degrees W - Monroe County. State and county outlines drawn from Census boundary data; the lake marker is placed by its USGS National Hydrography Dataset coordinates, not by eye. Schematic - not a survey map.
How Waterloo New Reservoir Stacks Up
- Larger than 20% of the 511 lakes counted in Illinois.
- About 66 miles from Carbondale, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Moredock Lake | Monroe | 7.6 mi | 357.56 acres |
| Brush Lake | St. Clair | 14 mi | 37.31 acres |
| Round Pond | St. Clair | 15 mi | 51.65 acres |
| Biebell Lake | St. Clair | 16 mi | 26.93 acres |
| Baldwin Lake | Randolph | 18 mi | 1,874.85 acres |
| River King Mine Lake | St. Clair | 18 mi | 28.53 acres |
Straight-line distance between lake centers.
Facts and Figures
Largest Lakes in Illinois
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Carlyle Lake | Clinton | 22,796.77 acres | - |
| 2 | Mine Number 21 Reservoir | Franklin | 17,062.04 acres | - |
| 3 | Upper Peoria Lake | Woodford | 15,460.64 acres | - |
| 4 | Lake Shelbyville | Shelby | 10,235.1 acres | - |
| 5 | Crab Orchard Lake | Williamson | 7,292.57 acres | - |
All 511 Illinois lakes ranked by surface area
Sources: USGS National Hydrography Dataset (The National Map) lake data (ID 79319846). Verified October 30, 2026.