Lakes / Missouri / Washington County / Apex Lake
Apex Lake, Missouri
48.11 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Missouri
37.95 degrees N, 90.68 degrees W - Washington 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 Apex Lake Stacks Up
- Larger than 45% of the 352 lakes counted in Missouri.
- About 54 miles from St. Louis, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Lac Carmel | St. Francois | 3.1 mi | 55.35 acres |
| Keyes Branch Mine Tailings Pond | Washington | 4.1 mi | 54.04 acres |
| Lac Capri | St. Francois | 4.5 mi | 106.05 acres |
| Lac Marseilles | St. Francois | 5.0 mi | 47.44 acres |
| Hornsey Lake | Washington | 7.2 mi | 73.88 acres |
| Lake Primrose | St. Francois | 7.4 mi | 31.63 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Apex Lake
How Big Is Apex Lake?
Apex Lake covers 48.11 acres in Washington County, Missouri.
What Is the Largest Lake in Washington County?
Sunnen Lake is the largest lake in Washington County, at 212.13 acres.
Largest Lakes in Missouri
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Lake of the Ozarks | Camden | 51,171.75 acres | - |
| 2 | Harry S Truman Reservoir | Benton | 49,365.93 acres | - |
| 3 | Table Rock Lake | Stone | 41,777.86 acres | - |
| 4 | Stockton Lake | Cedar | 24,962.34 acres | - |
| 5 | Mark Twain Lake | Ralls | 18,362.33 acres | - |
All 352 Missouri lakes ranked by surface area
Sources: USGS National Hydrography Dataset (The National Map) lake data (ID 6af355cb-43a0-40e7-98cc-ecbdfdfe3e31). Verified October 30, 2026.