| Flagstaff Lake | |
| Location: | Lake County, Oregon, United States |
| Coordinates: | 42.5825°N -119.8003°W[1] |
| Basin Countries: | United States |
| Agency: | Bureau of Land Management |
| Shore: | 13.3miles |
| Pushpin Map: | Oregon#USA |
| Pushpin Label Position: | bottom |
| Pushpin Map Alt: | Location of Flagstaff Lake in Oregon |
| Pushpin Map Caption: | Location of Flagstaff Lake in Oregon |
Flagstaff Lake is one of a group of interconnected, alkaline, high-desert lakes known as the Warner Lakes in the Warner Valley of Lake County in the U.S. state of Oregon. Flagstaff Lake lies between Upper Campbell Lake to the north and Swamp Lake to the south,[2] about northeast of Lakeview.[3] It has a surface area of about and a shoreline of about .[4]
The Warner Lakes vary in depth and volume depending on the weather and have completely dried up at times. Fish populations also vary. During a drought from 1988 to 1992, when all of the lakes went dry, some fish survived by retreating into a 20miles slough connected to the lakes. Historically, fish species in the lakes have included crappie, brown bullhead, largemouth bass, and redband trout.[2]