Ross Lake National Recreation Area - http://www.nps.gov/rola
Ross Lake National Recreation Area is the most accessible part of the North Cascades National Park Service Complex. Ross Lake National Recreation Area (118,000 acres, 47,200 hectares) is the corridor for scenic Washington State Route 20, the North Cascades Highway, and includes three reservoirs: 12,000-acre (4,800-hectare) Ross Lake, 910-acre (364-hectare) Diablo Lake, and 210-acre (84-hectare) Gorge Lake -- water gateways to more remote areas. Ringed by mountains, it offers many outdoor recreation opportunities along the upper reaches of the Skagit River, between the north and south units of North Cascades National Park. Information about Ross Lake NRA can be found on the North Cascades National Park web pages.
Co-managed with the adjacent North Cascades National Park & Lake Chelan National Recreation Area