Patapsco River

About

Birthplace of the national anthem. Long before the mills, the Patapsco valley was a borderland. The Susquehannock held the country to the north and the Piscataway the country to the south — Algonquian-speaking peoples of the Chesapeake region. The river's name descends from a Piscataway word meaning 'backwater' or 'tide covered with froth,' a fitting label for a stream that runs tidal at its mouth. European contact and disease devastated both nations during the 1600s, and by the time Ellicott City rose on the riverbank in 1772, the valley was being reordered around water power.

That reordering ran on the river's current. From roughly 1760 to 1840, iron furnaces and mills lined the Patapsco, their wheels turned by steady flow. The watershed's forests fed the same economy: from the 1830s through the 1920s the valley was logged to supply the regional timber industry and the railroad expansion of the later nineteenth century, worked by local sawmills and logging drives. The exhaustion of old-growth stands around 1910, the start of state forestry conservation in 1915, and the establishment of state forests in the 1930s brought that large-scale cutting to an end.

The river also drew some of the earliest sustained hydrological study in the region. USGS surveys in the 1870s through 1890s, gauging stations established from the 1880s into the 1910s, and state geological streamflow assessments through the 1930s produced the first comprehensive picture of the Patapsco's behavior. Later state water-pollution studies and Clean Water Act assessments reckoned with more than a century of logging, agricultural, and industrial impact, work that continues today through restoration and TMDL programs.

History here is inseparable from water. On September 13–14, 1814, during the British bombardment of Fort McHenry in Baltimore Harbor at the Patapsco's mouth, Francis Scott Key watched from a ship and wrote the poem that became 'The Star-Spangled Banner.' A century and a half later, in 1972, Tropical Storm Agnes tore through the valley floor and destroyed every park improvement in its path — a blow that prompted a new county sewer line in the 1970s whose installation has since lifted the river's water quality. The twenty-first century brought worse. On July 30, 2016, 6.60 inches of rain fell in just three hours, a one-in-a-thousand-year event that sent flash floods roaring down Ellicott City's Main Street, killing people and destroying buildings. The waters returned on May 27, 2018.

That same year marked a turn toward recovery. In 2018 the 113-year-old Bloede Dam — the world's first internally generating hydroelectric dam — was removed from the Patapsco, the largest dam removal in Maryland history. Its removal reopened more than 65 miles of upstream habitat to American shad, alewife, and blueback herring for the first time in over a century, a landmark for Chesapeake Bay watershed restoration. For paddlers, the river reads in three parts: the upper gorge from the McKeldin Area down to Daniels Dam, the mill-town corridor from Daniels Dam to Ellicott City, and the tidal Class I lower run from Ellicott City to Baltimore Harbor. Optimal boating flows fall between 150 and 800 cubic feet per second. The Patapsco endures as a river of memory and resilience — still shaped, still recovering, from the floods it cannot forget.