Up in the high east end of Calaveras County known as District 3, challenger Merita Callaway held a lead on incumbent Supervisor Mike Oliveira with 56 percent of 2,953 ballots counted, and two of six precincts in District 3 reporting.

The vast majority of those ballots, 2,575 of them, were vote-by-mail ballots. As of 10:15 p.m., ballots from four of six precincts in District 3 had not been counted or included in the rolling tally.

At 9:50 p.m., Oliveira said it was too soon to draw any conclusions from results so far.

“It's too early to make any kind of assessment of the results,” Oliveira said in a phone interview. There are still all 29 precincts to report, and six of those are in District 3. I’m still confident.”

Callaway could not immediately be reached for comment just before 10 p.m.

The unofficial, unverified, preliminary results were based solely on vote-by-mail ballots with no precincts reporting, the county registrar said at elections headquarters in San Andreas.

Earlier Tuesday evening, Callaway said she intends to keep track of election returns at home. Oliveira said he planned to join supporters to watch for results at a new barbecue place in Arnold.

As of Tuesday evening, there were an estimated 29,555 total registered voters in Calaveras County. Voter turnout was 81 percent in 2016 and 59 percent in 2014, the last midterm election.

District 3 in Calaveras County includes the Highway 4 corridor from Murphys east toward Forest Meadows, Hathaway Pines, Avery, Arnold, Calaveras Big Trees, Dorrington and Camp Connell.

Contact Guy McCarthy at gmccarthy@uniondemocrat.com or 588-4585. Follow him on Twitter at @GuyMcCarthy.