Delaware River — Upper

About

Delaware River, Upper — Henry Hudson, 1609. Long before European sails appeared, the Delaware watershed was the heart of Lenape territory — Lenapehocking. The upper river sustained large Lenape communities for thousands of years. That relationship was severed by colonization: European contact and the 1737 Walking Purchase dispossessed the Lenape from most of their homeland along the river.

Henry Hudson, sailing for the Dutch East India Company, nosed into the river's mouth on August 28, 1609, the first recorded European to encounter the waterway that would become the upper Delaware. The river took its name from Thomas West, 3rd Baron De La Warr, Colonial Governor of Virginia, applied by Samuel Argall in 1610. For centuries the reach — the 200-mile stretch of the 330-mile river from Hancock, New York, to the Delaware Water Gap — remained the eastern boundary of Pennsylvania.

Industry reshaped the valley in the nineteenth century. The watershed was logged from the 1830s through the 1920s to feed the 1850–1910s regional timber industry and the 1860–1910s railroad expansion. Sawmills, logging drives, and downstream lumber operations were the major operators. The pressure eased only when the old-growth stands were exhausted around 1910, state forestry conservation began in 1915, and state forests were established in the 1930s. The land's recovery was measured alongside its water: the 1870s–1890s USGS survey, the 1880s–1910s establishment of gauging stations, and the 1910s–1930s state streamflow assessments produced the first comprehensive hydrological picture of the river, later extended by 1950s–1970s water pollution control studies and Clean Water Act assessments after 1972.

The modern river runs cold and clean — one of the cleanest large rivers in the Northeast. Gauge 01446700 records an average of about 4,200 CFS, with an optimal paddling window of 2,000 to 8,000 CFS across Class I–II water. The 70-mile corridor divides naturally into three runs: Hancock to Narrowsburg, 30 miles of remote, wild eagle territory; Narrowsburg to Milford, 25 miles of Class I–II water beneath scenic bluffs; and Milford to the Delaware Water Gap, the most popular 15-mile stretch.

Protection arrived in layers. The Delaware Water Gap National Recreation Area was established in 1965, safeguarding 40 miles of the river's middle reach. Then, on November 10, 1978, the upper Delaware from Hancock, New York, to Sparrow Bush, New York, was designated a Wild and Scenic River — a designation driven directly by the Basin Commission's 1973 veto of Tocks Island. The corridor now supports one of the densest wintering bald eagle populations in the eastern United States. Recognition continues: the Delaware was named Pennsylvania's 2025 River of the Year by the Department of Conservation and Natural Resources and the Pennsylvania Organization for Waterways and Rivers, affirming the river's enduring ecological and recreational value. Outfitters like Kittatinny Canoes, running upper Delaware rentals and shuttles since 1941, still put paddlers on the water the dam would have drowned.