To designate certain Federal lands in the State of California as wilderness areas and as components of the National Wilderness Preservation System, to designate portions of the San Gabriel River and Little Rock Creek in that State as components of the National Wild and Scenic Rivers System, and for other purposes.

San Gabriel Mountains Forever Act of 2017 This bill designates specified federal lands in Angeles National Forest in California as wilderness and as components of the National Wilderness Preservation System. The bill amends the Wild and Scenic Rivers Act to designate specified segments of the East Fork San Gabriel River, the North Fork San Gabriel River, the West Fork San Gabriel River, and Little Rock Creek in California as wild, recreational, or scenic rivers and as components of the National Wild and Scenic Rivers System.