| Rattlesnake Lake | |
|---|---|
 View from Rattlesnake Ridge's Lower Ledge. Chester Morse Lake is in the far background | |
  Rattlesnake Lake  Rattlesnake Lake | |
| Location | King County, Washington |
| Coordinates | 47°25′48″N 121°46′30″W / 47.43°N 121.775°W |
| Basin countries | United States |
| Average depth | 20 ft (6 m) |
| Max. depth | 40 ft (12 m) |
| Surface elevation | 911 ft (278 m) |
| Islands | 0 |
| Settlements | 1 |
Rattlesnake Lake is a lake in the northwest United States, located in Rattlesnake Mountain Scenic Area in King County, Washington, approximately thirty miles (50 km) east of Seattle, south of Interstate 90.