It began at 9 a.m. Wednesday morning; all day long counting, sorting, verifying, more counting.
And if you think you could do it faster, think again.
"They need to compare the applications for absentee ballots, the number of ballots received, they need to compare the number of ballots actually processed at the polling place, versus the number for the school district," says James Long, director of business services for the Baraboo school district.
A tedious task, but one thousands of voters are paying close attention to.
Some supporters of the referendum are claiming widespread irregularities, including missing ballots and people who live outside the district voting on the referendum issue.
Peter Bildsten is a member of PASS, People Acting in Support of Students, a group in favor of the referendum.
"Did the right people vote in this referendum, did people who voted get the right ballots and did people who wanted to vote absentee ballot get a chance to vote?"
Those on the other side of the referendum issue don't think this recount will change the final outcome, because voting mishaps aren't why it failed.
Kevin Bartol is a school board candidate.
"The referendum wasn't explained thoroughly, it didn't go through the process it should have gone through."
Granted, 73 votes is a lot to be overturned in a recount, but for school officials like Long, it's too close for comfort.
"What happened in River Valley? The potential exists and that's why the process is continuing."
The board of canvassers is also recounting votes for the school board election.
They'll be at it again all day Thursday and Monday, if necessary.