Margaret Hunt Hill Bridge | |
---|---|
Coordinates | 32°46′48″N96°49′20″W / 32.7800°N 96.8221°W |
Carries | 6 lanes of Spur 366 |
Crosses | Trinity River |
Locale | Dallas, Texas |
Characteristics | |
Design | Cable-stayed bridge |
Total length | 1,206 feet (368 m) [1] |
Height | 400 feet (120 m) central arch pylon |
Longest span | 603 feet (184 m) [2] |
History | |
Designer | Santiago Calatrava |
Opened | March 29, 2012[3] [4] |
Statistics | |
Toll | None |
Location | |
The Margaret Hunt Hill Bridge is a bridge in Dallas, Texas, that spans the Trinity River. The bridge is named for Margaret Hunt Hill, an heiress and philanthropist. [5] The bridge was constructed as part of the Trinity River Project. Designed by Santiago Calatrava, it is one of three such bridges planned to be built over the Trinity; the second, the Margaret McDermott Bridge, is completed; the third cancelled. The span parallels the Ronald Kirk Bridge, a walking bridge that was previously the Continental Avenue bridge. [6]
The bridge, which opened in March 2012, is the first of a series of bridges that the office of Santiago Calatrava designed to span the Trinity River in downtown Dallas. [7] The bridge connects Spur 366 (Woodall Rodgers Freeway) in downtown to Singleton Boulevard in West Dallas. [8] Construction on the bridge began in December 2005. [9] The bridge cost $117 million to build. [10] A Dallas Morning News analysis put the project's total cost at $182 million. [11] Beginning in 2004, The Trinity Trust Foundation successfully worked to secure private funds in support of the Trinity River Corridor Project, including the Margaret Hunt Hill Bridge, Margaret McDermott Bridge, Ronald Kirk Bridge, trails and other components of the project.
On June 26, 2010, the signature 40-story center-support arch was topped with a central curved span, which can now be seen from many miles away in several directions. [12] The arch provides an additional feature to the Downtown Dallas skyline.
In 2012, the bridge received an Outstanding Civil Engineering Achievement Award from the Texas section of the American Society of Civil Engineers. [13] The bridge also received a 2012 European Convention for Constructional Steelwork Award For Steel Bridges. [14]
On June 1, 2020 at approximately 9:00 PM, several hundred protesters marching on the bridge were arrested in a kettling maneuver when Dallas Police routed the protest onto the bridge, blocked in the demonstration on both sides, fired teargas and pepper balls into the nonviolent crowd, then detained all protesters on the bridge for several hours. [15] On June 4, former Dallas Police Chief U. Reneé Hall announced that the protesters would not be charged following several days of attention and backlash from community members, political figures, local news outlets, and activist groups. [16]
The cable-stayed bridge supports its 1,206 feet (368 m) length and 603 feet (184 m) main span with a steel arch perpendicular to the roadway and a peak height of 400 feet (122 m). An array of twisting cables connect the underside of the arch's curved pylon to the bridge's platform. Fifty-eight (58) white strands descend from the arch and secure themselves along the centerline of the platform. The 16 feet (4.9 m) diameter support is composed of 25 individual segments, secured with 20,000 pounds (9,100 kg) of bolts and additional 450 tons (408,233 kg) of concrete. The bridge provides six lanes for vehicular traffic. [10] [17]
The bridge closely resembles two of three bridges constructed in 2005-2006 above the Autostrada A1 motorway and connecting roads in Reggio Emilia, Italy, that Calatrava had earlier designed. [18] In 2009, the European Convention for Constructional Steelwork gave the two bridges a European Steel Design Award, stating that the structures' original visual effects at different angles give the bridges "the aspect of huge musical instruments." [19]
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.
Santiago Calatrava Valls is a Spanish architect, structural engineer, sculptor and painter, particularly known for his bridges supported by single leaning pylons, and his railway stations, stadiums, and museums, whose sculptural forms often resemble living organisms. His best-known works include the Olympic Sports Complex of Athens, the Milwaukee Art Museum, the Turning Torso tower in Malmö, Sweden, the World Trade Center Transportation Hub in New York City, the Auditorio de Tenerife in Santa Cruz de Tenerife, the Margaret Hunt Hill Bridge in Dallas, Texas, and his largest project, the City of Arts and Sciences and Opera House in his birthplace, Valencia. His architectural firm has offices in New York City, Doha, and Zürich.
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Reggio nell'Emilia, usually referred to as Reggio Emilia, or simply Reggio by its inhabitants, and known until 1861 as Reggio di Lombardia, is a city in northern Italy, in the Emilia-Romagna region. It has about 171,944 inhabitants and is the main comune (municipality) of the province of Reggio Emilia.
The Trinity River is a 710-mile (1,140 km) river, the longest with a watershed entirely within the U.S. state of Texas. It rises in extreme northern Texas, a few miles south of the Red River. The headwaters are separated by the high bluffs on the southern side of the Red River.
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Spur 366, also named the Woodall Rodgers Freeway, is a freeway that connects Beckley Avenue and Singleton Boulevard in West Dallas to Interstate 35E and U.S. Highway 75 in central Dallas, Texas. The highway, as part of the downtown freeway loop, also serves as a dividing line between downtown Dallas on the south and the Uptown and Victory Park neighborhoods on the north.
The Trinity River Project is a public works project undertaken in the 2000s in the city of Dallas, Texas, United States. Its goal is to redevelop the Trinity River. The project aims to turn the river's path into a collection of sports fields, trails, nature centers, and recreational opportunities. At 10,000 acres (4,000 ha), it is one of the larger urban parks in the United States.
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Margaret Hunt Hill was an American heiress and philanthropist.
The Margaret McDermott Bridge is a conventional concrete pier-and-beam freeway bridge with cable-stayed bike lines over the Trinity River in Dallas, Texas. It replaced the late-1950s to early-1960s Interstate 30 (I-30) bridge, which reached its end of life. It was partially designed by Santiago Calatrava, and is part of the Trinity River Project and the Horseshoe Project. It was named for Margaret McDermott, an area philanthropist.
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