The crash happened late Friday, shortly after the 21-foot Stingray left the village of Piermont for a short trip across the river to Tarrytown, authorities said.
Rescuers searched for the missing boaters for several hours overnight before suspending the hunt. They resumed the search at about 9:30 a.m.
The missing woman was identified by her mother as 30-year-old Lindsey Stewart, of Piermont.
"It can't end like this," Carol Stewart, told WABC-TV as she waited on the shore. She said her daughter was to be married Aug. 10.
Four other people, including the groom-to-be, were hospitalized after being pulled from the damaged boat. At least one person aboard was knocked unconscious in the crash.
Rockland County Sheriff's Department Chief William Barbera declined to identify the victims. He said the barge, one of several loaded with construction material for an upcoming replacement of the bridge, was equipped with lights, but it was still difficult to see on the water so late at night.
He said the cause of the accident is under investigation.