Lakes / Colorado / Jackson County / Lake John
Lake John, Colorado
728 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Colorado
40.78 degrees N, 106.47 degrees W - Jackson 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 Lake John Stacks Up
- Larger than 92% of the 778 lakes counted in Colorado.
- About 82 miles from Boulder, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Alkali Lake | Jackson | 2.3 mi | 139 acres |
| Boettcher Lake | Jackson | 3.9 mi | 128 acres |
| North Delaney Lake | Jackson | 4.2 mi | 163 acres |
| East Delaney Lake | Jackson | 5.0 mi | 66 acres |
| South Delaney Lake | Jackson | 5.3 mi | 151 acres |
| Walden Reservoir | Jackson | 8.7 mi | 766 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Lake John
How Big Is Lake John?
Lake John covers 728 acres in Jackson County, Colorado.
What Is the Largest Lake in Jackson County?
Walden Reservoir is the largest lake in Jackson County, at 766 acres.
Largest Lakes in Colorado
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | John Martin Reservoir | Bent | 11,686 acres | - |
| 2 | Blue Mesa Reservoir | Gunnison | 8,944 acres | - |
| 3 | Lake Granby | Grand | 7,075 acres | - |
| 4 | Lake Meredith | Crowley | 5,539 acres | - |
| 5 | Adobe Creek Reservoir | Bent | 4,770 acres | - |
All 778 Colorado lakes ranked by surface area
Sources: USGS NHD (The National Map NHD MapServer layer 12) named waterbodies FTYPE 390/436; counties via Census point-in-polygon lake data (ID 128867000). Verified October 30, 2026.