Lake Dolloff is located in southern King County, Washington in the Lakeland North census-designated place.

Lake Dolloff is stocked annually with rainbow trout by the Washington State Department of Fish and Wildlife.

In addition to the stocked rainbow trout, black crappie, bluegill, brown bullhead, coastal cutthroat trout, largemouth bass, rock bass, smallmouth bass, and yellow perch are naturally present in the lake.

Nutrient concentrations are consistently high, leading to its classification as a eutrophic lake.

[3] The King County Sheriff's Office maintains Lake Dolloff substation, which services Lake Dolloff and other nearby areas of unincorporated King County.