Lakes / Colorado / Arapahoe County / Jolly John Reservoir
Jolly John Reservoir, Colorado
40 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Colorado
39.64 degrees N, 103.77 degrees W - Arapahoe 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 Jolly John Reservoir Stacks Up
- Larger than 32% of the 778 lakes counted in Colorado.
- About 65 miles from Denver, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Noonen Reservoir | Arapahoe | 11 mi | 88 acres |
| Ball Reservoir | Elbert | 16 mi | 87 acres |
| Baseline Reservoir | Morgan | 28 mi | 52 acres |
| Moore Reservoir Number 4 | Morgan | 28 mi | 35 acres |
| Rosener Reservoir | Morgan | 29 mi | 36 acres |
| Pawnee Raw Water Reservoir | Morgan | 41 mi | 137 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Jolly John Reservoir
How Big Is Jolly John Reservoir?
Jolly John Reservoir covers 40 acres in Arapahoe County, Colorado.
What Is the Largest Lake in Arapahoe County?
Cherry Creek Lake is the largest lake in Arapahoe County, at 886 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 120029169). Verified October 30, 2026.