DIXONVILLE — Five years ago, Robert Barry of Roseburg dreamed of building a retirement home on 20 rural acres in this community just east of Roseburg. The prospects for digging a productive well in Dixonville are poor, however. So Barry, like many other property owners there, paid $500 in 2007 to reserve the option of someday connecting to Roseburg’s water lines. Time passed, the economy slumped, and Barry, a 73-year-old retired business owner, postponed the house. He still hasn’t decided whether to build, but if he doesn’t make up his mind soon he may be left high and dry. The …