Social media images of the incident near the Connecticut city of Stamford showed rescuers extending an aerial ladder over the ice to reach the couple in the sinking vehicle.
“The extreme winds, snow and tide continued to move the vehicle and cause it to fill with water,” Matt Palmer, deputy chief of the Stamford Fire Department, said on its website, adding that the mishap came at the peak of a nor'easter storm.
Snow up to 2 feet (61cm) deep was dumped across the US northeast on Monday and Tuesday, killing three people and shutting down transport.
Some of the Stamford rescuers, wearing yellow protective suits, swam through the freezing waters of the Sound to pull the white pickup truck's occupants to safety before it sank completely in the 79-acre (32-hectare) beach-fringing Cummings Park.
“Let's go!” shouted one of the rescue team in the video, while another said, “Give me a hand!” as they pulled one passenger from the water.
A man pulled from the truck's cab through its rear window was taken to hospital, but a woman who had been riding in its rear cargo area declined medical aid, Palmer said in the website statement.
Firefighters and divers stayed behind to help lift the vehicle out of the water.
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