Lakes / Colorado / Hinsdale County / Castle Number 4 Reservoir
Castle Number 4 Reservoir, Colorado
49 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Colorado
37.85 degrees N, 107.25 degrees W - Hinsdale 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 Castle Number 4 Reservoir Stacks Up
- Larger than 42% of the 778 lakes counted in Colorado.
- About 96 miles from Aspen, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Castle Rock Lake | Hinsdale | 1.6 mi | 51 acres |
| Continental Reservoir | Hinsdale | 2.4 mi | 374 acres |
| Hermit Number 1 Reservoir | Hinsdale | 3.6 mi | 87 acres |
| Hermit Lakes | Hinsdale | 3.8 mi | 64 acres |
| Troutvale Reservoir Number 2 | Hinsdale | 3.9 mi | 97 acres |
| Troutvale Reservoir Number 1 | Hinsdale | 4.2 mi | 62 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Castle Number 4 Reservoir
How Big Is Castle Number 4 Reservoir?
Castle Number 4 Reservoir covers 49 acres in Hinsdale County, Colorado.
What Is the Largest Lake in Hinsdale County?
Rio Grande Reservoir is the largest lake in Hinsdale County, at 809 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 136353456). Verified October 30, 2026.