Spuyten Duyvil 10K

The Spuyten Duyvil 10K is an open water swimming event held along the tidal waters of the Hudson and Harlem rivers in New York. Organized by New York Open Water, the point-to-point journey covers a distance of 10.5 kilometres. Swimmers launch from the shoreline of JFK Marina and Park in Yonkers and travel downstream to finish at the historic Inwood Canoe Club on Manhattan's northern shoreline. Entering the water in September, participants encounter comfortable late-season river conditions as the tide sweeps down the Hudson. The event is designed as a non-competitive, untimed river journey rather than a race against the clock, allowing participants to savour the landscape. Safety remains paramount throughout the wide river corridor, and every swimmer is required to tow an inflatable swim buoy.

Swimmers of all styles are welcomed: the event is open to participants aged sixteen and older, and all swimwear, including wetsuits, is fully permitted. First organized in 2016, the journey has built a warm, communal following among distance swimmers. Over the years, the swim has welcomed remarkable athletes, including quadruple amputee Craig Dietz, who navigated the entire river course without arms or legs. At the end of the course, participants are welcomed ashore with a commemorative shirt and goodies, joining friends and supporters for a celebratory post-swim barbecue right on the dock at the Inwood Canoe Club.

The 10 km line down the eastern Hudson shore

The Spuyten Duyvil 10K starts at JFK Marina in Yonkers and finishes at the Inwood Canoe Club in Manhattan, passing the point where the Harlem River meets the Hudson. After a short westward leg to circle a buoy, swimmers turn south along the eastern Hudson shore for 10 km. The current runs with the swimmers at about 1 mph, and swim angels and safety repositioning may be used as needed. The listed water temperature for the swim is 66-72 °F. At the Inwood Canoe Club the swimmers turn left around the final buoy and leave the water by a ladder. The time limit is 2.5 hours, and the field is capped at 200 swimmers.

The Hudson River and the Spuyten Duyvil tidal confluence

As the route approaches the northern tip of Manhattan, the broad expanse of the Hudson constricts toward the mouth of the Harlem River. 17th-century settlers christened the passage Spuyten Duyvil, referring either to a freshwater spring or to a lost messenger. Today, equipped with modern safety buoys, swimmers glide smoothly through the passage.

Shorakapok and Spuyten Duyvil Creek: centuries of crossings

Long before European ships entered these waterways, the Wecquaesgeek band of the Lenape tribe lived along these shores for nearly seven centuries. The Lenape called Spuyten Duyvil Creek by the name Shorakapok, meaning the sitting down place or the place between the ridges. European exploration brought dramatic change to these tranquil waters in the autumn of 1609. By the seventeenth century, European settlers looked for practical ways to cross the unpredictable tidal currents of the creek. Frugal travelers regularly traversed the wading place to avoid paying ferry tolls. In 1693, Frederick Philipse constructed King's Bridge across the creek near today's West 230th Street. During the American Revolutionary War, military strategists recognized the strategic value of the high bluffs overlooking the river confluence.

High on the hill, American forces erected Fort Cockhill, a five-sided earthen fortification armed with two cannons that commanded the mouth of Spuyten Duyvil Creek. The redoubt fell to Hessian Grenadiers on November 16, 1776, during the fighting of the Battle of Fort Washington. Eighteenth-century stone kilns burned local Inwood marble to produce lime, supplying mortar for military battlements throughout New York Harbor.

The Harlem River Ship Canal and Spuyten Duyvil swing bridge

The natural passage between the rivers was radically reshaped by nineteenth- and twentieth-century civil engineering. Workers excavated the Harlem River Ship Canal to a width of 400 feet and depths reaching up to 18 feet. In 1914, the original meandering creekbed was completely filled in with massive quantities of rock excavated during the construction of Grand Central Terminal. Later channel excavations between 1937 and 1938 permanently severed a 13.5-acre peninsula from the Bronx mainland, annexing it into Manhattan. Erected in 1900, the Spuyten Duyvil Bridge sits on massive pile foundations sunk directly into the riverbed. Carrying passenger trains into Manhattan, the bridge deck sits remarkably low, resting only five feet above the surface of the river.

The bridge features a 290-foot-long swing section that swivels nearly 65 degrees. This swing mechanism opens more than a thousand times each year, predominantly during summer months to accommodate passing recreational boats and sightseeing cruises. Just east of the low-slung rail span stands the Henry Hudson Bridge.

Muscota Marsh and Inwood Hill Park beside the finish

Near the tidal creek lies Muscota Marsh. Its name comes from the Lenape language, translating to place of rushes or place in the reeds. The wetland combines both freshwater and saltwater marshes, engineered to capture and filter rainwater runoff before it enters the river channel. The marsh provides a peaceful sanctuary where the public and paddlers can engage directly with the Harlem River's water. A specialized dock accommodates canoes and kayaks. From these observation decks, spectators enjoy sweeping panoramas of Inwood Hill Park, the steel structure of the Henry Hudson Bridge, and the rugged Palisades cliffs across the Hudson. Between 2002 and 2009, conservationists carried out a restoration project using hacking boxes to reintroduce bald eagles to Manhattan's skies.