From the Wikipedia entry for Hell Gate, a narrow spot in New York City’s East River…
Hell Gate - Wikipedia, the free encyclopedia
"In 1851, the U.S. Army Corps of Engineers began to clear obstacles from the strait with explosives; the process would last 70 years. On September 24, 1876, the Corps used 50,000 pounds (23,000 kg) of explosives to blast the dangerous rocks, which was followed by further blasting work. On October 10, 1885, the Corps carried out the largest explosion in this process, annihilating Flood Rock with 300,000 pounds (140,000 kg) of explosives. The blast was felt as far away as Princeton, New Jersey and sent a geyser of water 250 feet (76 m) in the air."
Bang! It’s about 59 miles from New York City to Princeton.
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