Lakes / Colorado / Boulder County
Lakes in Boulder County, Colorado
39 lakes counted in Boulder County - the largest is Boulder Reservoir at 536 acres.
39
Lakes Counted
536 acres
Largest - Boulder Reservoir
Boulder County, highlighted, with its largest counted lakes dotted. Outlines from Census boundary data.
All Counted Lakes
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Boulder Reservoir | Boulder | 536 acres | - |
| 2 | Leggett and Hillcrest Reservoir | Boulder | 507 acres | - |
| 3 | Gross Reservoir | Boulder | 415 acres | - |
| 4 | Panama Reservoir Number 1 | Boulder | 335 acres | - |
| 5 | Terry Lake | Boulder | 320 acres | - |
| 6 | Ish Reservoir | Boulder | 317 acres | - |
| 7 | Base Line Reservoir | Boulder | 261 acres | - |
| 8 | McIntosh Lake | Boulder | 245 acres | - |
| 9 | Marshall Lake | Boulder | 220 acres | - |
| 10 | Barker Reservoir | Boulder | 198 acres | - |
| 11 | Button Rock Reservoir | Boulder | 191 acres | - |
| 12 | Highland Reservoir Number 2 | Boulder | 167 acres | - |
| 13 | Foothills Reservoir | Boulder | 160 acres | - |
| 14 | Left Hand Valley Reservoir | Boulder | 110 acres | - |
| 15 | Silver Lake | Boulder | 105 acres | - |
| 16 | Sixmile Reservoir | Boulder | 101 acres | - |
| 17 | Burch Lake | Boulder | 96 acres | - |
| 18 | Left Hand Reservoir | Boulder | 96 acres | - |
| 19 | Beaver Reservoir | Boulder | 92 acres | - |
| 20 | Lagerman Reservoir | Boulder | 74 acres | - |
| 21 | Divide Reservoir | Boulder | 60 acres | - |
| 22 | Gaynor Lake | Boulder | 60 acres | - |
| 23 | Clover Basin Reservoir | Boulder | 55 acres | - |
| 24 | Waneka Reservoir | Boulder | 48 acres | - |
| 25 | McCall Lake | Boulder | 44 acres | - |
| 26 | Long Lake | Boulder | 41 acres | - |
| 27 | Goose Lake | Boulder | 40 acres | - |
| 28 | Hayden Lake | Boulder | 38 acres | - |
| 29 | Allens Lake | Boulder | 35 acres | - |
| 30 | Island Lake | Boulder | 34 acres | - |
| 31 | Albion Lake | Boulder | 32 acres | - |
| 32 | Crystal Lake | Boulder | 32 acres | - |
| 33 | Gold Lake | Boulder | 31 acres | - |
| 34 | Lake Isabelle | Boulder | 31 acres | - |
| 35 | Teller Lake Number 5 | Boulder | 31 acres | - |
| 36 | Dodd Reservoir | Boulder | 28 acres | - |
| 37 | Harper Lake | Boulder | 27 acres | - |
| 38 | Walker Reservoir | Boulder | 26 acres | - |
| 39 | Erie Lake | Boulder | 25 acres | - |
Sources: USGS National Hydrography Dataset lake data; USGS. Verified October 30, 2026.