Hanford Reach National Monument Hanford Reach National MonumentStation reference point Ringold (Special regs)2,905 acres Saddle Mountain (Special regs)24,054 acres Wahluke East (Special regs)29,529 acres Columbia River Corridor (Closed)1,858 acres Rattlesnake (Closed)73,809 acres Wahluke West (Closed)31,361 acres