Under Frozen Tundra, an Icebreaking Ship Uncovers the Hudson.

As the sun came up on Friday morning, the Sturgeon Bay, a 140-foot Coast Guard icebreaker, creaked and lurched through a frozen river, sending cracks scattering as dark water rose to the surface in pools, spraying beads of water that hit the ice like marbles, solid by the time they landed.

From New York Harbor to Albany, the Hudson River wends, ebbs and flows over 120 miles, except when it doesn’t. Right now north of West Point, the river is captive to the wind and weather, a field of ice up to 1.5 feet thick.

At least once a day lately, the Sturgeon Bay has been crunching and crashing up and down the Hudson, clearing paths through the crystallized expanse so that boats carrying supplies can reach the communities counting on them. Barges on the Hudson transport 70 percent of the home heating oil in the Northeast. In 2014, barges brought 20 million barrels of it northward, as well as 100,000 tons of dry goods, like salt and cement.

It is not exactly news that this winter is cold. But it is very cold. On the once-water in Hudson, N.Y., the temperature floated around 1 or 2 degrees, with a wind chill of minus 20 degrees at times.

Lt. Ken Sauerbrunn, the commanding officer of the Sturgeon Bay, said this winter was the worst he had seen since 2004, when Coast Guard boats were dispatched to New York Harbor to clear ice for the Staten Island Ferry.

The winter mission of the Coast Guard fleet: break up ice in the Hudson River, the Great Lakes and other waterways throughout the Northeast.

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