Lake Scanewa is a man-made reservoir situated near Kosmos, WA, in Washington. It was created in the 1960s as part of the Mossyrock Dam hydroelectric project, which aimed to provide electricity to the region. The lake is fed by the Cowlitz River, which is a significant source of hydroelectric power for the area. The primary surface flow providers to the lake are the Cowlitz River and the Tilton River. The lake's water level fluctuates due to the snowpack in the surrounding mountains, which serves as a source of water for the region. The lake has been utilized for various recreational purposes, including fishing and boating, and plays a crucial role in supporting local agriculture. The reservoir is home to several fish species, including salmon and steelhead, and is a popular destination for anglers.