Lakes / Oregon / Jefferson County / Boulder Lake
Boulder Lake, Oregon
58 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Oregon
44.79 degrees N, 121.73 degrees W - Jefferson 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 Boulder Lake Stacks Up
- Larger than 41% of the 642 lakes counted in Oregon.
- About 55 miles from Bend, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Trout Lake | Jefferson | 0.7 mi | 29 acres |
| Island Lake | Jefferson | 1.1 mi | 33 acres |
| Dark Lake | Jefferson | 1.7 mi | 25 acres |
| Long Lake | Marion | 2.0 mi | 30 acres |
| Monon Lake | Marion | 2.9 mi | 94 acres |
| Olallie Lake | Marion | 3.1 mi | 195 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Boulder Lake
How Big Is Boulder Lake?
Boulder Lake covers 58 acres in Jefferson County, Oregon.
What Is the Largest Lake in Jefferson County?
Lake Billy Chinook is the largest lake in Jefferson County, at 3,081 acres.
Largest Lakes in Oregon
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Upper Klamath Lake | Klamath | 62,095 acres | - |
| 2 | Lake Umatilla | Morrow | 50,042 acres | - |
| 3 | Lake Abert | Lake | 37,137 acres | - |
| 4 | Summer Lake | Lake | 31,602 acres | - |
| 5 | Harney Lake | Harney | 31,290 acres | - |
All 642 Oregon 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 148979467). Verified October 30, 2026.