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57-485: The BP Pedestrian Bridge , or simply BP Bridge , is a girder footbridge in the Loop community area of Chicago , United States. It spans Columbus Drive to connect Maggie Daley Park (formerly, Daley Bicentennial Plaza) with Millennium Park , both parts of the larger Grant Park . Designed by Pritzker Prize -winning architect Frank Gehry and structurally engineered by Skidmore, Owings and Merrill , it opened along with

114-402: A berm (or berme) was a level space between a parapet or defensive wall and an adjacent steep-walled ditch or moat . It was intended to reduce soil pressure on the walls of the excavated part to prevent its collapse. It also meant that debris dislodged from fortifications would not fall into (and fill) a ditch or moat . In the trench warfare of World War I , the name was applied to

171-399: A berm is a raised ridge of pebbles or sand found at high tide or storm tide marks on a beach . In snow removal, a berm or windrow refers to the linear accumulation of snow cast aside by a plow . Earth berms are used above particle accelerator tunnels to provide shielding from radiation. In open-pit mining , a berm refers to dirt and rock piled alongside a haulage road or along

228-486: A delightful pleasure that was designed to emphasize its artistic elements while de-emphasizing its concrete and steel support system. The New York Times notes that the artist Anish Kapoor 's attempts to hide the seams of Cloud Gate were an interesting contrast to Gehry's architectural efforts. Gehry took pride in making the BP Pedestrian Bridge flaunt its seams. Beginning with Gehry's earliest bridge designs,

285-455: A heavy load without structural problems caused by its own weight, it has won awards for its use of sheet metal . The bridge is known for its aesthetics , and Gehry's style is seen in its biomorphic allusions and extensive sculptural use of stainless steel plates to express abstraction. The pedestrian bridge serves as a noise barrier for traffic sounds from Columbus Drive. It is a connecting link between Millennium Park and destinations to

342-413: A hollow box girder design to minimize weight, as the ground that supports the bridge covers underground parking garages. The concrete base and box girder are flanked by a hollow stainless steel skeleton. Despite its hollow structure, and the fact that it is designed as a concealed beam bridge , the footbridge is built to highway standards and can support a full capacity load of pedestrians. The bridge

399-473: A road is also called a berm and in New Zealand the word describes a publicly owned grassed nature strip sometimes planted with trees alongside urban roads (usually called a verge). [1] In snowboard cross , a berm is a wall of snow built up in a corner. In mountain biking , a berm is a banked turn formed by soil, commonly dug from the track, being deposited on the outer rim of the turn. In coastal systems,

456-596: A scaly skin", while Gehry said he thought the bridge looked like a river, but added he might be the only one who thought that. The way the bridge flows in a continuum of unexpected directions is a break from Gehry's other work and other more traditional urban and architectural forms nearby. Pulitzer Prize -winning architecture critic Kamin gave the bridge four stars (out of a possible four) in his review and admires how "computers have given Gehry unparalleled formal freedom" to design "the complexity of its geometry" and multidimensional curvatures. The bridge provides views of both

513-529: A similar feature at the lip of a trench , which served mainly as an elbow-rest for riflemen . In modern military engineering, a berm is the earthen or sod wall or parapet, especially a low earthen wall adjacent to a ditch. The digging of the ditch (often by a bulldozer or military engineering vehicle ) can provide the soil from which the berm is constructed. Walls constructed in this manner are an obstacle to vehicles , including most armoured fighting vehicles but are easily crossed by infantry . Because of

570-428: A six-month period. During construction, about 200 shingles were installed per day. The bridge includes two types of structural steel: steel that is 2.0 inches or 5.1 centimetres thick and 20.0 inches or 51 centimetres in diameter for the approaches and box girders for the span. CATIA software was used to handle the complex geometric layout. To ensure accurate fitting and alignment to the sloping, curving sides of

627-411: A stainless steel veneer , cost between $ 12.1 and $ 14.5 million. It contains large sculptural plates of curvilinear stainless steel instead of more standard flat plates. The bridge's curvilinear design gives it a flowing, natural look, instead of the linear, rigid form of standard bridges. Although its steel girders rest on concrete pylons and most of the bridge is solid concrete, the bridge uses

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684-478: Is a level space, shelf, or raised barrier (usually made of compacted soil ) separating areas in a vertical way, especially partway up a long slope. It can serve as a terrace road, track, path, a fortification line , a border / separation barrier for navigation, good drainage, industry, or other purposes. The word is from Middle Dutch and came into usage in English via French. In medieval military engineering ,

741-594: Is also greater than the maximum vehicle height of 13 feet 6 inches (4.1 m) set by the Illinois Vehicle Code. According to the Chicago Tribune the width of the "trenchlike" area spanned is approximately 150 feet (46 m), while The New York Times reports the bridge is over ten times longer than Columbus Drive is wide. BP Bridge begins in Millennium Park between the trellis system over

798-451: Is designed so that its inclined surfaces have a continuous five percent slope rather than landings and switchback ramps, which provides easy access for the physically challenged. The gently sloped ramp eliminates the need for lifts or any of the other common types of ramps (L-shaped, switchback, U-shaped, straight), and helped the park earn the 2005 Barrier-Free America Award for its exemplary barrier-free design. Gehry had hoped to design

855-417: Is designed without standard handrails and uses waist-high parapets as guard rails instead. The bridge was built using 22- gauge stainless steel type 316 plates (0.031 inches or 0.79 millimeters thick), with an angel hair finish and a flat interlocking panel process. Stainless steel type 316 is known for its excellent welding characteristics, as well as for its resistance to pitting . According to

912-402: Is everything from the bearing pads, up - it is what supports the loads and is the most visible part of the bridge. The substructure is the foundation which transfers loads from the superstructure to the ground. Both must work together to create a strong, long-lasting bridge. The superstructure consists of several parts: The substructure is made of multiple parts as well: Berm A berm

969-408: Is no longer a true girder bridge. Girder bridges have existed for millennia in a variety of forms depending on resources available. The oldest types of bridges are the beam , arch and swing bridges, and they are still built today. These types of bridges have been built by human beings since ancient times, with the initial design being much simpler than what we utilize today. As technology advanced

1026-472: Is not an option and the Brazilian hardwood would be damaged by rock salt . The city not only mandates that the bridge be swept and washed daily, but also that the parapets be wiped free of fingerprints. The bridge has also had controversial closures in the summer, which were related to larger park concerns. On September 8, 2005, Toyota Motor Sales USA paid $ 800,000 to rent the bridge and all but four venues in

1083-506: Is the berm proposed for Vermont Yankee nuclear power plant in Vermont. At Baylor Ballpark , a baseball stadium on the campus of Baylor University , a berm is constructed down the right field line. The berm replaces bleachers, and general admission tickets are sold for fans who wish to sit on the grass or watch the game from the top of the hill. Berms are also used as a method of environmental spill containment and liquid spill control. Bunding

1140-510: Is the construction of a secondary impermeable barrier around and beneath storage or processing plant, sufficient to contain the plant's volume after a spill. This is often achieved on large sites by surrounding the plant with a berm. The US Environmental Protection Agency (EPA) requires that oils and fuels stored over certain volume levels be placed in secondary spill containment. Berms for spill containment are typically manufactured from polyvinyl chloride (PVC) or geomembrane fabric that provide

1197-462: Is typically used to refer to a steel beam. In a beam or girder bridge, the beams themselves are the primary support for the deck, and are responsible for transferring the load down to the foundation. Material type, shape, and weight all affect how much weight a beam can hold. Due to the properties of the second moment of area , the height of a girder is the most significant factor to affect its load capacity. Longer spans, more traffic, or wider spacing of

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1254-456: The Chicago Tribune , the bridge materials used in construction include 2,000 rot -resistant Brazilian hardwood boards for the deck, 115,000 stainless steel screws and 9,800 stainless steel shingle plates. According to Architecture Metal Expertise, the bridge has "10,400 stainless steel trapezoidal panels in 17 different shop fabricated configurations [which] involved 1,000 shop hours". The sheet metal work totaled 5,900 field hours over

1311-572: The School of the Art Institute of Chicago . The BP Pedestrian Bridge officially opened, along with the rest of Millennium Park, on July 16, 2004. It remained unnamed at the ribbon-cutting, but before the July park opening, energy firm BP had paid $ 5 million for the bridge sponsorship and naming rights. Timothy Gilfoyle, author of Millennium Park: Creating a Chicago Landmark , notes that a controversy surrounds

1368-454: The "tasteless" corporate naming of several of the Park's features, including the bridge, which was named after an oil company . It is well documented that naming rights were sold for high fees, and Gilfoyle was not the only one who chastised park officials for selling naming rights to the highest bidder. Public interest groups have crusaded against commercialization of Chicago parks. However, many of

1425-400: The 1960s, Gehry has made artistic use of scaled animals such as fish and snakes, which first appeared in his architectural designs in the 1980s. Many references to the bridge describe it as snakelike for its winding path, and some even refer to the stainless steel plates as scales with discussion of reptilian forms. Kamin calls it "a bridge that resembles a giant silver snake, complete with

1482-780: The Historic Michigan Boulevard District and Lake Michigan in a way that Kamin says makes it a belvedere . Kamin also recommends anyone having a bad day to stroll across the bridge, adding, "You won't get where you're going quickly, but you'll feel a whole lot better once you're done." Girder bridge The term "girder" is often used interchangeably with "beam" in reference to bridge design. However, some authors define beam bridges slightly differently from girder bridges. A girder may be made of concrete or steel. Many shorter bridges, especially in rural areas where they may be exposed to water overtopping and corrosion, utilize concrete box girder. The term "girder"

1539-592: The Jay Pritzker Pavilion's great lawn and the Lurie Garden ; the design was changed so that the west ramp coincided with the boardwalk of the Lurie Garden seam. The bridge winds its way northward along the eastern edge of Millennium Park before crossing Columbus Drive in a C-shaped curve, above underground parking garage entrances. In Daley Bicentennial Plaza the bridge has an S-shape, then turns east. BP Bridge

1596-460: The adverse effects of running water on exposed topsoil . Following the 2010 Deepwater Horizon oil spill in the Gulf of Mexico, the construction of berms designed to prevent oil from reaching the fragile Louisiana wetlands (which would result in massive erosion) was proposed early on, and was officially approved by the federal government in mid-June, 2010, after numerous failures to stop and contain

1653-404: The beams will all directly result in a deeper beam. In truss and arch -style bridges, the girders are still the main support for the deck, but the load is transferred through the truss or arch to the foundation. These designs allow bridges to span larger distances without requiring the depth of the beam to increase beyond what is practical. However, with the inclusion of a truss or arch the bridge

1710-448: The bridge is closed in winter because ice cannot be safely removed from its wooden walkway, it has received favorable reviews for its design and aesthetics. Since the mid-19th century, Grant Park has been Chicago's "front yard", with Lake Michigan to the east and the Loop to the west. Columbus Drive runs north–south through Grant Park, with Daley Bicentennial Plaza in the northeast corner of

1767-404: The bridge so that it could be constructed without a support column in the center of Columbus Drive. However, Chicago Tribune architecture critic Blair Kamin notes that if he had done so, the bridge might not have been as sleek. Building the bridge without the column would have required load-bearing cantilevers ( beams supported only on one side) from structural positions on opposite sides of

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1824-493: The bridge was expected to complement the neighboring Pritzker Pavilion. Some have suggested that the bridge and the pavilion are mere extensions of Gehry's work in other cities. For example, according to Gilfoyle, both structures embody Gehry's established asymmetrical style, evoking fluid, continuous motion and sculptural abstraction. They also feature metallic facades and aesthetic curves, but they are said to be more refined, reduced and dynamic than much of his other work. Since

1881-510: The bridge, 4,400 custom-made convex, concave and radiused cladding panels were fabricated on site by sheet metal contractor Custom Metal Fabricators (CMF). CMF used 57,000 square feet (5,300 m) of stainless steel sheet to cover the sides, which have a combined perimeter length of 1,728 feet (526.7 m). CMF built special heated enclosures so that work could continue on site through the winter. They designed, fabricated and installed custom type 4  brushed stainless steel parapets serving in

1938-405: The city announced it was negotiating with Frank Gehry to design a proscenium arch and orchestra enclosure for a band shell in the new park, as well as a pedestrian bridge crossing Columbus Drive between Millennium Park and Daley Bicentennial Plaza. The city also sought donors to cover the cost of Gehry's work, which would eventually become Jay Pritzker Pavilion and the BP Pedestrian Bridge. At

1995-504: The city announced plans to expand the park to include features that became Cloud Gate , Crown Fountain , the McDonald's Cycle Center , and the BP Pedestrian Bridge. Later that month, Gehry unveiled his next design, which depicted a winding bridge. While the neighboring Jay Pritzker Pavilion changed relatively little from Gehry's 1999 design when built, the bridge went through several proposed designs. The proposal made in early 2000, which

2052-477: The city. In April 1999, the city announced that the Pritzker family had donated $ 15 million to fund Gehry's band shell and an additional nine donors committed a total of $ 10 million more to the park. That same day, Gehry agreed to the design request. In November 1999, when he unveiled his initial plans for the bridge and band shell, Gehry admitted the bridge's design was underdeveloped because funding for it

2109-600: The day that the two halves of the bridge were joined, each side of Columbus Drive was closed for a 12-hour period and a 360- short-ton (320- long-ton ; 330  t ) crane was used to install the girders. Before bringing the crane to the location, screw jacks were used to shore up the underground garage roof to hold the crane's weight. The landscaping surrounding the bridge was redesigned by landscape architect Terry Guen. Honey locusts , ash and maple trees were removed and replaced with three varieties of magnolia and more than two dozen ornamental and canopy trees along

2166-422: The donors have a long history of local philanthropy and the funds were essential to providing necessary financing for several features of the park. After the park opened, some of the bridge's foibles became apparent. The bridge has had to be closed during the winter because freezing conditions make it unsafe. Since the bridge is over an expressway-like trench of Columbus Drive, shoveling the snow onto passing cars

2223-441: The ease of construction , such walls can be made hundreds or thousands of kilometres long. A prominent example of such a berm is the 2,700 km (1,700 mi) Moroccan Western Sahara Wall . Berms are also used to control soil erosion and sedimentation by reducing the rate of surface runoff . The berms either reduce the velocity of the water , or direct water to areas that are not susceptible to erosion, thereby reducing

2280-439: The east, such as the nearby lakefront, other parts of Grant Park and a parking garage . BP Bridge uses a concealed box girder design with a concrete base, and its deck is covered by hardwood floor boards. It is designed without handrails , using stainless steel parapets instead. The total length is 935 feet (285 m), with a five percent slope on its inclined surfaces that makes it barrier free and accessible . Although

2337-499: The eastern foot of the bridge in Daley Bicentennial Plaza. Other preliminary construction work included setting reinforcing rods for the bridge in the concrete roof deck of the parking garage located under the park. Before its official opening on 22 May 2004, the bridge had a private ribbon-cutting ceremony attended by Gehry and Mayor Daley. During the weekend of the ribbon-cutting, Gehry was awarded an honorary degree from

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2394-426: The edge of a dump point. Intended as a safety measure, they are commonly required by government organizations to be at least half as tall as the wheels of the largest mining machine on-site. Physical security systems employ berms to exclude hostile vehicles and slow attackers on foot (similar to the military application without the trench). Security berms are common around military and nuclear facilities. An example

2451-574: The empty north section of Daley Bicentennial Plaza, leading north. It would have required elevators to conform to the Americans with Disabilities Act . This plan was abandoned because it would have segregated the handicapped. Gehry had only designed two bridges previously, both in the mid-1990s (Pferdeturm USTRA Bridge in Hanover, Germany and Financial Times Millennium Bridge in London, United Kingdom ) but neither

2508-401: The methods were improved and were based on the utilization and manipulation of rock, stone, mortar and other materials that would serve to be stronger and longer. In ancient Rome , the techniques for building bridges included the driving of wooden poles to serve as the bridge columns and then filling the column space with various construction materials. The bridges constructed by Romans were at

2565-445: The oil leak with more advanced technologies. In coastal geography, a berm is a bank of sand or gravel ridge parallel to the shoreline and a few tens of centimetres high, created by wave action throwing material beyond the average level of the sea. Earth is piled up against exterior walls and packed, sloping down away from the house. The roof may or may not be fully earth covered, and windows/openings may occur on one or more sides of

2622-426: The park from 6 a.m. to 11 p.m. On August 7, 2006, Allstate paid $ 700,000 to rent the bridge and most of the park for a day. The exclusion of commuters who normally walk through the park and tourists lured by its attractions was controversial, though the city said the money raised paid for free public programs in Millennium Park. The bridge is noted for its sculptural characteristics and Kamin describes it as

2679-499: The park. West of Columbus Drive, the northwest corner of the park had been Illinois Central rail yards and parking lots until 1997, when it became available for development by the city as Millennium Park. Millennium Park is also north of Monroe Street and the Art Institute , east of Michigan Avenue , and south of Randolph Street . For 2007, Millennium Park trailed only Navy Pier as a Chicago tourist attraction. In February 1999,

2736-737: The place of handrails on the bridge. CMF earned the 2005 Tom Guilfoy Memorial Architectural Sheet Metal Award, by the California chapter of the Sheet Metal and Air Conditioning Contractors' National Association for the project. In 2005 it received a Merit Award from the National Steel Bridge Alliance , and an Excellence in Structural Engineering award from the Structural Engineers Association of Illinois . On

2793-558: The rest of Millennium Park on July 16, 2004. Gehry had been courted by the city to design the bridge and the neighboring Jay Pritzker Pavilion , and eventually agreed to do so after the Pritzker family funded the Pavilion. Named for energy firm BP , which donated $ 5 million toward its construction, it is the first Gehry-designed bridge to have been completed. BP Bridge is described as snakelike because of its curving form. Designed to bear

2850-456: The shelter. Due to the building being above ground, fewer moisture problems are associated with earth berming in comparison to underground/fully recessed construction. For general applications, a berm is a physical, stationary barrier of some kind. For example, in highway construction, a berm is a noise barrier constructed of earth, often landscaped , running along a highway to protect adjacent land users from noise pollution . The shoulder of

2907-472: The street; this would have been expensive and labor-intensive, because it would have required excavating large portions of the parking garages on both sides of the street. Moreover, on the Daley Bicentennial Plaza side, the optimal location for the supporting cantilever would have been at the location of the Monroe Street Garage. Thus, the preferred bridge design was altered to avoid problems related to

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2964-487: The time basic but very dependable and strong while serving a very important purpose in social life. As the Industrial Revolution came and went, new materials with improved physical properties were utilized; and wrought iron was replaced with steel due to steel's greater strength and larger application potential. All bridges consist of two main parts: the substructure, and the superstructure. The superstructure

3021-489: The time, the Chicago Tribune dubbed Gehry "the hottest architect in the universe" in reference to the acclaim for his Guggenheim Museum Bilbao . Millennium Park project manager Edward Uhlir said "Frank is just the cutting edge of the next century of architecture", and noted that no other architect was being sought. Gehry was approached several times by Skidmore, Owings & Merrill architect Adrian Smith on behalf of

3078-607: The underground parking garages. The bridge is both a connector and a viewing platform for the park. It was designed to link the Historic Michigan Boulevard District and the entire Loop to the west with the Lake Michigan lakefront to the east. It was also designed to be a berm noise barrier blocking noise on the eight-lane Columbus Drive from the Park's outdoor band shell (Jay Pritzker Pavilion), by deflecting traffic sounds upward. The bridge, which uses steel girders , reinforced concrete abutments and deck slabs , hardwood deck, and

3135-700: Was built. The final design for the bridge was revealed in an exhibit at the Chicago Cultural Center on June 10, 2000. As designed and built, the bridge is 935 feet (285.0 m) long and 20 feet (6.1 m) wide, with a 14-foot-6-inch (4.42 m) Columbus Drive clearance. The clearance was designed to slightly exceed the 14-foot (4.3 m) standard set by the United States Department of Transportation Federal Highway Administration for urban area interstate bridge clearances, and to allow for additional future layers of pavement below. This height

3192-499: Was expected to be executed in 2002, included a bridge that was a mere 170 feet (51.8 m) long and 20 feet (6.1 m) wide. That design was not approved, and Chicago Mayor Richard M. Daley 's disapproval of Gehry's subsequent design of an 800–900-foot (240–270 m) bridge caused Gehry to come up with ten more designs. The first of these plans was for a Z-shaped bridge that would have run northwest–southeast with western ramps in Millennium Park, leading south, and eastern ramps in

3249-410: Was not yet committed. Even at this early point, the need for a sound barrier for Columbus Drive traffic noise was recognized, although Gehry indicated this might take the form of a berm , or raised barrier. The need to fund a bridge to span the eight-lane Columbus Drive was evident, but some planning for the park was delayed in anticipation of details on the redesign of Soldier Field . In January 2000,

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