Echo Bridge

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Echo Bridge is a historic stone bridge that spans the Charles River, connecting Needham and Newton Upper Falls in Massachusetts. Built in 1876–77 to carry the Sudbury Aqueduct and a pedestrian path, it sits in the Hemlock Gorge Reservation. When it was built, it was the second-longest masonry arch in the United States. The seven-arch bridge is about 500 feet long; its main crossing over the Charles River is a 137-foot arch with a 69-foot radius and a crown of 51 feet, about 70 feet above the river. The foundations are granite on bedrock.

The bridge is listed on the National Register of Historic Places (1980) and was named an American Water Landmark (1981). It offers two viewing spots: a walkway on top and a platform beneath the arch where visitors can hear echoes, a feature that gave the bridge its name. Views overlook white water, a waterfall, and a hemlock-lined gorge, with some old mill buildings visible nearby.

Hemlock Gorge Reservation, a 23-acre area, is managed by the Massachusetts Department of Conservation and Recreation. The bridge sits just off Route 9 where it crosses Route 128.

In 2006, the railing repairs led to a temporary closure; fencing was installed and later replaced with modern railings inside the historic rails. There are ongoing efforts to reconstruct the historic railing design. The Sudbury Aqueduct remains mostly an emergency backup, and it was reactivated on May 1, 2010 to supply clean water to communities affected by a MWRA failure.