Lakes / Oregon / Lake County / South Arm Reservoir
South Arm Reservoir, Oregon
103 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Oregon
42.08 degrees N, 120.81 degrees W - Lake 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 Arm Reservoir Stacks Up
- Larger than 58% of the 642 lakes counted in Oregon.
- About 107 miles from Medford, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Albertson Reservoir | Lake | 2.3 mi | 97 acres |
| Strawberry Reservoir | Lake | 2.8 mi | 233 acres |
| Lost Lake | Klamath | 5.0 mi | 29 acres |
| Dog Lake | Lake | 5.3 mi | 208 acres |
| Tull Reservoir | Klamath | 7.8 mi | 40 acres |
| Grohs Reservoir | Klamath | 8.4 mi | 85 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About South Arm Reservoir
How Big Is South Arm Reservoir?
South Arm Reservoir covers 103 acres in Lake County, Oregon.
What Is the Largest Lake in Lake County?
Lake Abert is the largest lake in Lake County, at 37,137 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 82757507). Verified October 30, 2026.