SYRACUSE - A powerful nor'easter caused widespread flooding in eastern New York and left more than 83,000 homes and businesses across the state without power Monday.

The overnight barrage of snow and rain made driving difficult for morning commuters and led to one fatal accident in Essex County Sunday night, authorities said. It also sent stream and river levels rising in the Hudson Valley.

Dozens of roads were washed out. Some residents in Deerpark and Washingtonville in Orange County were evacuated by boat Monday as flood waters overran their homes. A mobile home park in the Town of Newburgh also had to be evacuated.

“Our concern is the pattern seems to be stalled in the eastern part of the state. We can't really assess the damage until the storm is over,” said Dennis Michalski of the State Emergency Management Office.

The late-spring storm dumped snow across central and northern New York and drenched the eastern region with mostly rain. Boonville in Oneida County reported 19 inches of snow, while Crown Point in Essex County had 16 inches. More than a foot of snow also was reported in parts of Chenango, Madison and Saratoga counties, the National Weather Service said.

New York State Electric and Gas reported about 36,000 of its customers lost power, with 15,000 of those in the Binghamton region. NYSEG spokesman Clay Ellis said it could be Thursday before everyone has power again.

Rochester Gas & Electric said damaged power lines cut electricity to 2,400 customers in the Rochester area.

With rain continuing over many parts of the state, flood warnings were issued for portions of the Delaware River in New York's Southern Tier and for towns along the Mohawk River, where local emergency management officials reported small streams flooding and several mudslides.

In central New York, the snow caused the cancellation of classes in dozens of school districts, including the cities of Ithaca and Cortland.