Blackfoot Clearwater Stewardship Act of 2017 This bill directs the Department of Agriculture (USDA) to complete a landscape assessment of the Seeley Lake Ranger District of the Lolo National Forest in Montana to: (1) assess the ecological condition of its forests and watersheds; and (2) identify actions needed to facilitate ecosystem sustainability, resilience, and health by assisting in the recovery of its forest ecosystems. A collaboratively developed restoration project within the district may be carried out according to certain provisions applicable to authorized hazardous fuel reduction projects under the Healthy Forests Restoration Act of 2003. The bill designates specified federal land in the forest as: (1) the Otatsy Recreation Management Area, and (2) the Spread Mountain Recreation Area. USDA shall, if, a local collaborative group submits a proposal to improve motorized and nonmotorized recreational trail opportunities within the district, analyze the proposal in accordance with the National Environmental Policy Act of 1969. It may also provide for the construction of any of the routes included in such proposal. The bill designates specified wilderness additions in the forest as wilderness areas and components of the National Wilderness Preservation System.