| Shelf Lake | |
| Location: | Custer County, Idaho |
| Coords: | 44.0704°N -114.5678°W |
| Type: | Glacial |
| Outflow: | Little Boulder Creek to East Fork Salmon River |
| Basin Countries: | United States |
| Length: | 902feet |
| Width: | 579feet |
| Area: | 7.8acres |
| Elevation: | 8943feet |
| Pushpin Map: | Idaho#USA |
| Pushpin Map Alt: | Location of Shelf Lake in Idaho, USA. |
Shelf Lake is an alpine lake in Custer County, Idaho, United States, located in the White Cloud Mountains in the Sawtooth National Recreation Area. The lake is named for a distinct rock shelf extending around the south and west shores of the lake.
The lake is accessed from Sawtooth National Forest trail 683.[1] Shelf Lake is northeast of Merriam Peak and located in the lower section of the Boulder Chain Lakes Basin.