King County, Washington
Pipe Lake is partially located in both Covington and Maple Valley, Washington. The lake is 52 acres in size with a mean depth of 27 feet; and with a maximum depth 65 feet. The watershed is 314 acres in size and drains to Lake Lucerne.
The King County Department of Natural Resources, together with the Cities of Maple Valley and Covington, continue with a multi-year effort to eradicate Hydrilla verticillata (Hydrilla) from Lake Lucerne and Pipe Lake (located formerly within unincorporated King County and within the cities since 1998).
City of Maple Valley: About our lakes (external link)