St. Catherine Creek National Wildlife Refuge St. Catherine Creek National Wildlife RefugeStation reference point Butler Unit (Special regs)4,817 acres Cloverdale Unit (Special regs)6,110 acres Mobility Impaired Units (Special regs)1.4 acres Sibley Impoundments (Special regs)998 acres Sibley Unit (Special regs)9,345 acres Closed to Hunting (Closed)3,517 acres