Ross Lake National Recreation Area is a US National Recreation Area located in north central Washington just south of the Canadian border. It is the most accessible part of the North Cascades National Park Service Complex which also includes North Cascades National Park and Lake Chelan National Recreation Area. Ross Lake NRA follows the Skagit River corridor from the Canadian border to the western foothills of the Cascades.
The NRA contains a portion of scenic Washington State Route 20, the North Cascades Highway, and includes three reservoirs: 12,000-acre (4,900 ha) Ross Lake, 910-acre (370 ha) Diablo Lake, and 210-acre (85 ha) Gorge Lake. These reservoirs make up the Skagit Hydroelectic Project operated by Seattle City Light. Nestled in the "American Alps" the Ross Lake NRA bisects the north and south units of North Cascades National Park.