The search for a missing boater in the aftermath of a commercial fishing boat capsizing and sinking on the Columbia River near the mouth of the White Salmon River on Wednesday is now being characterized as a recovery mission.   The Hood River County Sheriff’s Office identified the missing man as Michael Shufeldt of Woodland.  The fishing boat was located by the Skamania County Dive Team on Thursday afternoon about 40 feet deep in the Columbia, and efforts to recover it are ongoing.  The Sheriff’s Office said Shufeldt was not located in the vicinity of the boat and is presumed to be deceased as additional searches of the area using an underwater remotely operated vehicle has not located him.  Information gathered by investigators so far indicates the sinking was a result of rapidly deteriorating weather conditions the Sheriff’s Office called “treacherous,” as the boat capsized after taking a large wave over the stern.  Six people were rescued, with two transported to a hospital.  Numerous agencies and civilian volunteers have been involved in the search.