A 52-year-old man had to be airlifted to a Portland hospital on Wednesday afternoon after suffering a severe back injury jumping from the top of Rock Creek Falls.  According to the Skamania County Sheriff’s Office, Robert Joseph Sellars impacted the rocks below the falls, resulting in a serious back injury.  Crews from Stevenson Fire/Skamania Fire District 2 and Skamania County EMS were able to reach Sellars by navigating through chest deep water, then stabilize him and move him from the shallow water.  A helicopter from U.S. Coast Guard Astoria was able to hoist Sellars out of the canyon and take him to Oregon Health Sciences University Hospital in Portland.  The sheriff’s office says Sellars’ wife told them her husband is a “cliff diver” and videos himself jumping off cliffs and posting the footage on his website.  She and her sons were filming Sellars’ jump from below.