STOCKBRIDGE, Vt. – After hundreds of thousands of tons of rock were hauled out and tens of thousands of man-hours were spent, Vermont celebrated the completion of the biggest single engineering challenge following the flooding from the remnants of Hurricane Irene.

Just in time for the new year, and four months after the storm hit, Route 107 between Bethel and Stockbridge was reopened Thursday. The state highway, a major east-west thoroughfare, is the last to reopen after being closed by flooding.

The road’s reopening was marked with a ceremony at a Stockbridge school, where scores of local residents and state officials tossed fluorescent orange baseball caps into the air.

“It will cut our commute time down, it will lessen our trauma of looking at all the damage and the moonscape,” said Stockbridge resident Melissa Thompson, who had to navigate a 70-minute detour to get her son to school and to get to work for the past few months. “We’ll probably miss all the flaggers (who) we got to know on the way. It just means so much to us to not have to make that commute every day.”

Much remains to be done on Route 107 and across the state, but Vermonters used the reopening as a moment to pause and celebrate. Many people are still struggling to rebuild their homes and their lives. The state is just totaling up the bill, and the Legislature is preparing to deal with a variety of Irene-induced, long-term challenges.

The repair of Route 107 posed one of the biggest tests after the storm left a dozen towns cut off from the outside world for days, damaged or destroyed more than 500 miles of roads and 200 bridges, killed six and reshaped much of the low-lying countryside.

Irene ripped up Vermont on Aug. 28. The downtowns of communities from Whitingham in southern Vermont to Waterbury, just west of Montpelier, were flooded to levels not seen since the state’s epic flood of 1927.

Neale Lunderville, the state’s appointed chief recovery officer, said it would be years before many Vermont families are back to what he calls “a new normal.”

“If we want to have a robust recovery and one that brings us back to a place where we are stronger, smarter and safer than before Irene, we have to continue to remember what Irene did and what we need to do to recover from that,” Lunderville said.

The stretch of highway between Bethel and Stockbridge is one of the state’s major east-west arteries, and sections of the highway were part of the riverbank where the road and the White River pass through a narrow cut in the Green Mountains. Irene’s run through Vermont funneled record volumes of water through that narrow pass, where it tore riverbanks to pieces.

“All of a sudden the road ended and then we were looking at river and mud and what used to be huge sheets of asphalt that had shifted into the river,” said Maine Army National Guard Capt. Norman Stickney, of Gardiner, who arrived five days after the storm.

“It was like something fell from the sky and completely crushed all of the asphalt and scooped it away and dumped it into the river.”

In the three-mile section of road that was hardest hit, about 4,000 feet of Route 107 was completely gone, said Vermont Transportation Agency Engineer Eric Foster, who oversaw the rebuilding of the highway. A job that would normally take two years was done in 119 days after the first work crews — the soldiers from the Maine National Guard and other states — arrived.

In addition to the guard, it took two contractors, 250,000 tons of rock, at least 20,000 hours of heavy equipment time, 7,500 feet of guardrail, 38 culverts and 46 companies over 16 weeks to repair the highway, according to information provided by the Vermont Transportation Agency.