Lakes / Illinois / Macoupin County / Smith Reservoir
Smith Reservoir, Illinois
63.75 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Illinois
39.22 degrees N, 89.87 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 Smith Reservoir Stacks Up
- Larger than 46% of the 511 lakes counted in Illinois.
- About 41 miles from Springfield, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Lake Carlinville | Macoupin | 2.1 mi | 155.92 acres |
| Lake Catatoga | Macoupin | 4.3 mi | 42.75 acres |
| New Gillespie Lake | Macoupin | 4.8 mi | 205.34 acres |
| Old Gillespie Lake | Macoupin | 5.1 mi | 68.7 acres |
| Beaver Dam Lake | Macoupin | 5.1 mi | 52 acres |
| Bullard Lake | Macoupin | 7.4 mi | 49.17 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Smith Reservoir
How Big Is Smith Reservoir?
Smith Reservoir covers 63.75 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 154289031). Verified October 30, 2026.