(Portland, OR)  --  With a 790-million-dollar school bond on the ballot, voter turnout for tomorrow's election is below 20-percent.  County elections director Tim Scott tells KATU-TV that, as of the end of business yesterday, turnout had reached about 18-percent.  However, Scott expects more ballots to be returned today, which he says could boost that number to as much as 30-percent.  He says this is a typical "off-year" election, in which there are no major local, state or national political races on the ballot.