Lakes / Colorado / Arapahoe County / South Platte Reservoir
South Platte Reservoir, Colorado
149 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Colorado
39.57 degrees N, 105.05 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 South Platte Reservoir Stacks Up
- Larger than 74% of the 778 lakes counted in Colorado.
- About 12 miles from Denver, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Eaglewatch Lake | Arapahoe | 0.4 mi | 46 acres |
| Cooley Lake | Arapahoe | 1.3 mi | 150 acres |
| McLellan Reservoir | Arapahoe | 1.9 mi | 191 acres |
| Chatfield Lake | Jefferson | 2.1 mi | 1,389 acres |
| Johnson Reservoir | Jefferson | 3.0 mi | 60 acres |
| Bowles Lake | Arapahoe | 3.3 mi | 93 acres |
Straight-line distance between lake centers.
Facts and Figures
Waterbody ID{1711BC21-D607-41CD-B841-7D0E7C4A4F5A}
CountyArapahoe
Lake TypeReservoir
Coordinates39.5717, -105.0505
Questions About South Platte Reservoir
How Big Is South Platte Reservoir?
South Platte Reservoir covers 149 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 {1711BC21-D607-41CD-B841-7D0E7C4A4F5A}). Verified October 30, 2026.