Lakes / Texas / McMullen County / Big Tank
Big Tank, McMullen County, Texas
36.57 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Texas
28.27 degrees N, 98.54 degrees W - McMullen County. State and county outlines drawn from Census boundary data; the lake marker is placed by its Texas Parks and Wildlife Department coordinates, not by eye. Schematic - not a survey map.
How Big Tank Stacks Up
- Larger than 30% of the 1,641 lakes counted in Texas.
- About 80 miles from San Antonio, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Brown Lake | McMullen | 2.2 mi | 30.59 acres |
| Medio de Llano Tank | McMullen | 11 mi | 30.43 acres |
| Big Mule Tank | McMullen | 13 mi | 49.53 acres |
| Nueces Ranch Lake | McMullen | 15 mi | 34.42 acres |
| Guadalupe Tank | McMullen | 16 mi | 44.73 acres |
| Wiley Tank | McMullen | 16 mi | 60.95 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Big Tank
How Big Is Big Tank?
Big Tank covers 36.57 acres in McMullen County, Texas.
What Is the Largest Lake in McMullen County?
Wiley Tank is the largest lake in McMullen County, at 60.95 acres.
Deepest Natural Lakes in Texas
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Amistad Reservoir | Val Verde | 64,900 acres | 217 ft |
| 2 | Comanche Creek Reservoir | Pecos | 3,272 acres | 125 ft |
| 3 | Belton Lake | Bell | 12,385 acres | 124 ft |
| 4 | O. H. Ivie Reservoir | Concho | 19,149 acres | 119 ft |
| 5 | Stillhouse Hollow Lake | Bell | 6,429 acres | 107 ft |
All 107 Texas lakes ranked by depth
Largest Lakes in Texas
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Toledo Bend Reservoir | Sabine | 181,600 acres | 110 ft |
| 2 | Sam Rayburn Reservoir | San Augustine | 114,500 acres | 80 ft |
| 3 | Lake Livingston | San Jacinto | 90,000 acres | 77 ft |
| 4 | Falcon Reservoir | Zapata | 80,555.4 acres | - |
| 5 | Amistad Reservoir | Val Verde | 64,900 acres | 217 ft |
All 1,641 Texas lakes ranked by surface area
Sources: USGS National Hydrography Dataset (The National Map) lake data (ID 94626066). Verified October 30, 2026.