The board agreed Thursday on a plan to raise the toll to $4 in November and $6 in 2013. It originally proposed increasing the toll to $5 on Oct. 1 and $8 in 2013.
The decision came as the board agreed on revisions to a package of toll increases that were proposed in June. Area residents turned out in droves at public hearings this summer to protest the proposed hikes.
Officials say the increases, the first since 1975, are necessary to maintain toll facilities.
A formal vote on the package is scheduled for Thursday.