Friedman's car was found along the east side of the bridge in Cortlandt, said State Police Investigator Steven Connolly.
Although his body has not been located, Connolly said Friedman's family had been notified that he is the person they are searching for.
Currently, there are numerous agencies helping with the search that began around 4 a.m. Friday morning after video surveillance showed a person jumping from the middle span of the bridge.
"Our people have in the water for more than six hours searching for his body," Connolly said.
Friedman, a Democrat, joined the town board in 2010, hasn't been seen since police located his car.
Rockland County Sheriff Louis Falco, whose office is working with the state police, said the case is difficult for him since he knew Friedman well.
Rockland County Executive Ed Day said he was stunned and saddened by the apparent sudden loss Friedman.
"While we may have been at the opposite sides of the political spectrum, I can say unequivocally that in his role at the Legislature, Daniel put politics aside and always worked for the good of the people of Rockland. May his memory be for a blessing," Day said.
State police plan to continue searching the waters until they locate Friedman's body.
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