Check your facts. Barred owls are not native to the PNW.. Also I've haven't heard anything of them hybridizing, The barred owls will take out spotted owls utter slaughter, and other wise out compete the spotted owls...
http://www.fws.gov/oregonfwo/species/data/northernspottedowl/BarredOwl/default.asp
"Barred owls are native to eastern North America. It is believed they began expanding west of the Mississippi River around the turn of the 20th century. This could have been a natural range expansion or human-caused, or a combination of both. The most common theory is that the barred owl’s westward movement was caused by changes to the environment in the Great Plains as people increasingly settled there and dramatically altered the landscape. This may have removed natural barriers that previously inhibited the barred owl’s westward expansion. "