MORIAH — Even with dozens of repair crews working today, utility and emergency officials said it might be Tuesday before power is fully restored in southern Essex County.

An ice storm swept through parts of Moriah, Crown Point, Schroon and Ticonderoga just after midnight today, bringing trees and limbs down on wires and sheering off tops of power poles.

Around 4 a.m., a main transmission line came down and National Grid customers from Westport to Ticonderoga lost power.

“Many roads are closed,” said Essex County Emergency Services Director Raymond Thatcher.

“Trees are down, lines are down. National Grid is working on the high (voltage) lines, they’re working on the areas that were hardest hit.”

A state of emergency was declared in Essex County and the towns of Moriah, Crown Point and Ticonderoga. In Franklin County, the Village of Tupper Lake also declared a state of emergency.

“We are advising people not to drive in those areas,” Thatcher said.

National Grid said it had more than 7,800 customers without power in Essex County today, the hardest hit portion of its coverage area.

“We’ve got a lot of customers back today but some of these outlying areas — it’s tough to get to the lines,” said Tom Corbett, a spokesperson for the utility company. Power was restored to Port Henry and some other places just before 4 p.m., but Thatcher said it will be “Tuesday or later before all customers are back on.”

Corbett said there were more than 200 crews — many private contractors — working statewide to make power restorations today.

“It’s a 24/7 operation right now,” he said. “We’ve got crews out there all night.”

Corbett said the “lion’s share” of those crews were in Essex County.

“We’ve got guys driving from Buffalo to Ticonderoga,” he said.

New York State Electric & Gas — which serves some areas of northern Essex County — was also reporting outages in the North Country, with around 5,000 in Clinton, Franklin, Essex and Hamilton counties.

“There is mutual aid on the way from other areas of the state,” Regional Operations Manager Mark Leta said this afternoon.