The Panama Canal is an artificial 82-kilometer (51-mile) waterway in Panama that connects the Atlantic Ocean with the Pacific Ocean, cutting across the Isthmus of Panama, and is a conduit for maritime trade. Locks at each end lift ships up to Gatun Lake, an artificial fresh water lake 26 meters (85 ft) above sea level, created by damming up the Chagres River and Lake Alajuela to reduce the amount of excavation work required for the canal. Locks then lower the ships at the other end. An average of 200,000,000 L (52,000,000 US gal) of fresh water is used in a single passing of a ship. The canal is threatened by low water levels during droughts.
The Leonard P. ZakimBunker Hill Memorial Bridge is a cable-stayed bridge completed in 2003 across the Charles River in Boston, Massachusetts. It is a replacement for the Charlestown High Bridge, an older truss bridge constructed in the 1950s.
A cable-stayed bridge has one or more towers, from which cables support the bridge deck. A distinctive feature are the cables or stays, which run directly from the tower to the deck, normally forming a fan-like pattern or a series of parallel lines. This is in contrast to the modern suspension bridge, where the cables supporting the deck are suspended vertically from the main cable, anchored at both ends of the bridge and running between the towers. The cable-stayed bridge is optimal for spans longer than cantilever bridges and shorter than suspension bridges. This is the range within which cantilever bridges would rapidly grow heavier, and suspension bridge cabling would be more costly.
The Welland Canal is a ship canal in Ontario, Canada, and part of the St. Lawrence Seaway and Great Lakes Waterway. The canal traverses the Niagara Peninsula between Port Weller on Lake Ontario, and Port Colborne on Lake Erie, and was erected because the Niagara River—the only natural waterway connecting the lakes—was unnavigable due to Niagara Falls. The Welland Canal enables ships to ascend and descend the Niagara Escarpment, and has followed four different routes since it opened.
A swing bridge is a movable bridge that can be rotated horizontally around a vertical axis. It has as its primary structural support a vertical locating pin and support ring, usually at or near to its center of gravity, about which the swing span can then pivot horizontally as shown in the animated illustration to the right.
Panamax and New Panamax are terms for the size limits for ships travelling through the Panama Canal. The limits and requirements are published by the Panama Canal Authority (ACP) in a publication titled "Vessel Requirements". These requirements also describe topics like exceptional dry seasonal limits, propulsion, communications, and detailed ship design.
The Woodrow Wilson Memorial Bridge, also known as the Woodrow Wilson Bridge or the Wilson Bridge, is a bascule bridge that spans the Potomac River between Alexandria, Virginia and Oxon Hill, Maryland in Prince George's County, Maryland. The original bridge was one of only a handful of drawbridges in the Interstate Highway System. It contained the only portion of the Interstate System owned and operated by the federal government until construction was completed and it was turned over to the Virginia and Maryland departments of transportation.
The Seven Mile Bridge is a bridge in the Florida Keys, in Monroe County, Florida, United States. It connects Knight's Key in the Middle Keys to Little Duck Key in the Lower Keys. Among the longest bridges in existence when it was built, it is part of the Overseas Highway in the Keys, which is part of the 2,369-mile (3,813 km) U.S. Route 1.
The Bridge of the Americas is a road bridge in Panama which spans the Pacific entrance to the Panama Canal. Designed by Sverdrup & Parcel, it was completed in 1962 at a cost of US$20 million, connecting the north and south American land masses, connecting the American Continent. Two other bridges cross the canal: the Atlantic Bridge at the Gatun locks and the Centennial Bridge.
The Golden Ears Bridge is a six-lane extradosed bridge in Metro Vancouver, British Columbia. It spans the Fraser River, connecting Langley on the south side with Pitt Meadows and Maple Ridge on the north side. The bridge opened to traffic on June 16, 2009. The bridge replaced a previous ferry service several kilometers upstream and will be run by a private consortium, the Golden Crossing General Partnership, until June 2041.
The idea of the Panama Canal dates back to 1513, when the Spanish conquistador Vasco Núñez de Balboa first crossed the Isthmus of Panama. This narrow land bridge between North and South America was a fine location to dig a water passage between the Atlantic and Pacific Oceans. The earliest European colonists recognized this, and several proposals for the construction of a canal were made.
The Saint John River High Level Crossing is a steel girder bridge crossing the Saint John River at Coytown, New Brunswick, Canada.
An extradosed bridge employs a structure that combines the main elements of both a prestressed box girder bridge and a cable-stayed bridge. The name comes from the word extrados, the exterior or upper curve of an arch, and refers to how the "stay cables" on an extradosed bridge are not considered as such in the design, but are instead treated as external prestressing tendons deviating upward from the deck. In this concept, they remain part of the main bridge superstructure.
The Svinesund Bridge is a through arch bridge crossing Iddefjord at Svinesund, and joining Sweden and Norway. Svinesund is a sound separating the Swedish municipality of Strömstad from the Norwegian municipality of Halden, and thus it is the border between Norway and Sweden in this region. The bridge is the westernmost border crossing between the two countries and carries the European route E6 which is a major traffic route in the area, connecting Oslo and the rest of Norway with Gothenburg, Malmö, Copenhagen and the rest of Europe.
The Pierre Pflimlin Bridge is a 957-metre (3,140 ft) long motorway cantilever bridge over the river Rhine, with a main span measuring 205 metres (673 ft). It connects Germany and France, at Kehl and Strasbourg. It is named after Pierre Pflimlin, a former French prime minister, and was opened in 2002. It was funded by France, Germany and the European Union.
Miguel Rosales is president and principal designer of Rosales + Partners, an architecture firm based in Boston, Massachusetts. He specializes in bridge aesthetics and design. Some examples of these bridges include; Phyllis J. Tilley Memorial Bridge, Christina and John Markey Memorial Pedestrian Bridge, and Liberty Bridge at Falls Park on the Reedy River.
The Bang Na Expressway, officially Burapha Withi Expressway, is a 55-kilometer-long (34 mi) six-lane elevated highway in Thailand. It is a toll road running above National Highway 34 and is owned by the Expressway Authority of Thailand (EXAT).
The Atlantic Bridge is a road bridge in Colón, Panama spanning the Atlantic entrance to the Panama Canal. Completed in 2019, it is the third bridge over the canal after the Bridge of the Americas and the Centennial Bridge, both on the Pacific side of the canal.
