Lakes / Colorado / Weld County / Riverside Reservoir
Riverside Reservoir, Colorado
3,633 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Colorado
40.34 degrees N, 104.26 degrees W - Weld 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 Riverside Reservoir Stacks Up
- Ranks #7 for surface area among the Colorado lakes counted so far - 3,633 acres.
- The largest lake in Weld County among those counted.
- About 57 miles from Denver, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Empire Reservoir | Weld | 7.1 mi | 2,486 acres |
| Jackson Reservoir | Morgan | 11 mi | 2,434 acres |
| Greasewood Lake | Weld | 11 mi | 118 acres |
| Sunken Lake | Morgan | 12 mi | 53 acres |
| Bijou Number 2 Reservoir | Morgan | 16 mi | 414 acres |
| Briscoe Lake | Weld | 16 mi | 46 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Riverside Reservoir
How Big Is Riverside Reservoir?
Riverside Reservoir covers 3,633 acres in Weld County, Colorado.
What Is the Largest Lake in Weld County?
Riverside Reservoir is the largest lake in Weld County, at 3,633 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 120652594). Verified October 30, 2026.