Lakes / Illinois / Macoupin County / New Gillespie Lake
New Gillespie Lake, Illinois
205.34 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
39.15 degrees N, 89.88 degrees W - Macoupin 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 New Gillespie Lake Stacks Up
- Larger than 76% of the 511 lakes counted in Illinois.
- About 46 miles from Springfield, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Old Gillespie Lake | Macoupin | 1.1 mi | 68.7 acres |
| Lake Catatoga | Macoupin | 4.4 mi | 42.75 acres |
| Smith Reservoir | Macoupin | 4.8 mi | 63.75 acres |
| Beaver Dam Lake | Macoupin | 6.6 mi | 52 acres |
| Lake Carlinville | Macoupin | 6.7 mi | 155.92 acres |
| Mount Olive Lake | Macoupin | 7.2 mi | 39.54 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About New Gillespie Lake
How Big Is New Gillespie Lake?
New Gillespie Lake covers 205.34 acres in Macoupin County, Illinois.
What Is the Largest Lake in Macoupin County?
Otter Lake is the largest lake in Macoupin County, at 419.34 acres.
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 154289938). Verified October 30, 2026.