|
Echo Bridge is a historic masonry bridge spanning the Charles River between Needham to Newton Upper Falls, Massachusetts, and Ellis Street in Newton. The bridge carries the Sudbury Aqueduct and foot traffic, and is located in the Hemlock Gorge Reservation. At the time of its construction in 1875-77 it was the second longest masonry arch in the country. It was listed on the National Register of Historic Places in 1980, and was named an American Water Landmark in 1981. ==Description== The bridge crosses over Hemlock Gorge where the Charles River passes over the fall line in Newton Upper Falls. There are still old mill buildings in view from the bridge, but most of the gorge remains naturally overgrown with hemlocks. The bridge has two viewing locations, the pedestrian walk on top of the bridge and a platform underneath where visitors can hear the eponymous echoes. Views include white water, a waterfall and the hemlock-lined gorge. The Hemlock Gorge Reservation including the gorge is maintained by the Massachusetts Department of Conservation and Recreation. The bridge is located just off Route 9 where it crosses Route 128. Despite being in the midst of a tangle of highways (a major interchange of the Massachusetts Turnpike is also nearby), the river itself is tree-lined and natural. The bridge is long, and consists of a series of seven arches. The longest of these, that crosses the Charles, has a span of , and is a segmented arch with a radius of and a crown of . Five of the arches span , while that spanning Ellis Street is . At its crown the bridge is approximately above the river. The bridge's foundations are made of granite resting on bedrock.〔(【引用サイトリンク】title=NRHP nomination for Echo Bridge )〕 Echo Bridge underwent extensive renovations in 2006 and was closed to the public for much of the year; it has been reopened. The aqueduct, which has been serving only as an emergency backup for some years, was reactivated during a state of emergency declared on May 1, 2010. The line was used to carry clean water to parts of 38 communities affected by a catastrophic failure elsewhere in the MWRA system. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Echo Bridge」の詳細全文を読む スポンサード リンク
|