Northern Rockies Ecosystem Protection Act This bill designates specified National Forest System lands, National Park System lands, and public lands in Idaho, Montana, Oregon, Washington, and Wyoming as wilderness and as components or additions to existing components of the National Wilderness Preservation System. The bill also designates specified federal lands as biological connecting corridors and as special corridor management areas. The Department of the Interior and the Department of Agriculture (USDA) shall accept the donation of valid existing permits or leases authorizing grazing on specified public lands or National Forest System lands. The bill designates segments of specified rivers and creeks in Idaho, Montana, and Wyoming as components of the National Wild and Scenic Rivers System. The bill designates specified areas as wildland recovery areas. USDA shall develop a wildland recovery plan for each recovery area. A panel of independent scientists shall study roadless lands greater than 1,000 acres that are within the National Forest System in the Wild Rockies bioregion in Idaho, Montana, Oregon, Washington, or Wyoming, but not designated as components of the National Wilderness Preservation System, for their role in maintaining biological diversity. The bill prohibits road construction, timber harvest, oil or gas leasing, mining, or other development that impairs the natural and roadless qualities of the land.