I received a copy of a divorce record circa 1930 from the courthouse in Condon. They are very friendly and helpful but if they aren't able to do lookups (I went in person), I will get it for you the next time I am over there.
Also, unless you want to look at the actual file, the Gilliam County Historical Society has records on most individuals who lived in the Condon area and they may have a newspaper article with the date.
Gilliam County Historical Society Highway 19 at Burns Park P.O. Box 377 Condon, Oregon, 97823 (503) 384-4233
Was from your Franklin Campbell related to the James, Jack(John) or Stewart Campbell families from the Condon/Trail Fork area?