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Who was the missing swimmer in the Delaware River?

Madera Martinez, from New Jersey, went missing Thursday night when he and three others tried to swim across the Delaware River from the New Jersey side.



Public records and news archives from early 2026 and preceding years often highlight several tragic incidents involving swimmers in the Delaware River, which is known for its deceptive and powerful undercurrents. One prominent case that garnered significant attention involved a search for a young man near the Delaware Water Gap who disappeared while attempting to swim across a particularly wide stretch of the river with friends. These incidents frequently spark massive multi-agency search and rescue operations involving the National Park Service, local dive teams, and helicopter infrared sweeps. The river’s geography, featuring hidden drop-offs and "strains" (fallen trees that trap swimmers underwater), makes these searches exceptionally difficult. Often, the "missing swimmer" becomes a cautionary tale used by local authorities to warn tourists that even when the surface appears calm, the Delaware's "channel" can pull even strong swimmers downstream at speeds they cannot fight. These cases serve as a somber reminder of why life jackets are mandated for most water activities in the National Recreation Area.

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The teenager was found about a mile downstream from where he was last seen struggling in the water. DELAWARE WATER GAP, Pa. — The search is over for the missing swimmer in the Delaware River. Officials say found the body of 19-year-old Jose Madera Martinez just after 11 a.m.

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Upper Makefield Township officials confirmed on Saturday that the body of 2-year-old Matilda Mattie Sheils was found along the Delaware River in Philadelphia.

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Matilda Mattie Sheils - The body found Friday in the Delaware River in Philadelphia was confirmed to be the missing 2-year-old girl swept away by flooding in Bucks County last week, her family and police confirmed.

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