WOODBRIDGE — About 40 people gathered at Harbor View conference center in Woodbridge at 7 p.m. Thursday for the capstone event of a daylong series of events to discuss the future of a passenger ferry that could, someday, provide commuter service between Prince William County and Washington, D.C.

“We need to use our region’s last unused highway, the Potomac River,” said Prince William Woodbridge District Supervisor Frank Principi, whose long pushed for the creation of a “fast ferry” from Woodbridge to Washington.