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Longfellow Bridge
The Longfellow Bridge, also known to locals as the "Salt-and-Pepper Bridge" or the "Salt-and-Pepper-Shaker Bridge" due to the shape of its central towers, carries Route 3 and the Massachusetts Bay Transportation Authority's Red Line across the Charles River to connect Boston's Beacon Hill neighborhood with the Kendall Square area of Cambridge, Massachusetts.
The bridge falls under the jurisdiction and oversight of Massachusetts Department of Transportation. The bridge carries approximately 28,600 cars and 90,000 mass-transit passengers every weekday. A portion of the elevated Charles/Massachusetts General Hospital rapid transit station lies at the eastern end of the bridge, which connects to Charles Circle.
==Description==
Longfellow Bridge is a combination railway and highway bridge. It is wide, long between abutments, and nearly one-half mile in length, including abutments and approaches. It consists of eleven steel arch spans supported on ten masonry piers and two massive abutments. The arches vary in length from at the abutments to at the center, and in rise from to . Headroom under the central arch is at mean high water.
The two large central piers, long and wide,〔 feature four carved, ornamental stone towers that provide stairway access to pedestrian passageways beneath the bridge. Its sidewalks were originally both wide, but , for unknown reasons, the upstream sidewalks are narrower than the downstream ones.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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