Oregon Parks and Recreation Department is prohibiting all campfires, open flames and propane fire rings in Memaloose, Viento, and Ainsworth state parks as of 8 a.m. Wednesday morning.  The ban applies to all areas in those parks and will be in effect until further notice from OPRD.  Columbia River Gorge state parks manager Clay Courtright says recent high temperatures and strong winds in the Gorge have elevated the danger of accidental, human-caused wildfires.  The ban applies to wood, charcoal, wood pellets and all other flame sources that cannot be extinguished immediately.  Propane fire rings are prohibited as well, including smaller propane rings that may fit inside or on top of existing campground fire rings.  Other valve-operated flame sources, such as liquid fuel cooking devices, are allowed under the ban, but cannot be left unattended.  Smoking is allowed under the ban, but still subject to existing rules about smoking in Oregon State Parks.