Three Sisters Bridge, Unbuilt bridge project over Potomac River in Washington, D.C., United States.
Three Sisters Bridge was a proposed six-lane crossing over the Potomac River connecting Georgetown with Virginia territory. The planned structure was designed to rise about 160 feet above the water and extend the George Washington Memorial Parkway across the river.
The concept for connecting the three islands dates back to 1789 when city planner Pierre L'Enfant included it in his vision for the capital. The project became a concrete proposal in the 20th century but was eventually abandoned during the 1970s.
The three islands in the Potomac River became a focal point for environmental activism in the 1970s, when people fought to protect them from development. The site represented a turning point in how communities approached major construction projects affecting natural spaces.
The project was never completed and the site is not open to the public. The islands and river can be viewed from nearby walking paths along the Potomac shoreline.
Hurricane Agnes destroyed the partially built supports in 1972, accelerating the project's cancellation at a critical moment. The storm essentially decided what local activists and planners had been debating for years.
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