Malheur National Wildlife Refuge Malheur National Wildlife RefugeStation reference point Boundary (Open)2,588 acres S. Malheur Lake (Open)6,397 acres Buena Vista (Special regs)36,244 acres N. Malheur Lake (Special regs)22,579 acres Double O (Closed)19,172 acres Harney/Mud Lakes (Closed)45,639 acres P Ranch (Closed)25,405 acres Safety Zones (Closed)30,046 acres