Prior to 2017, two lanes of the bridge would remain open to public vehicle traffic; this policy was changed in 2017 to close the entire bridge to public vehicle traffic for the duration of the event. Borings were made for a detailed geological study of the route. Total width of the roadway: 54 feet (16.5 m), Two outside lanes: 12 feet (3.7 m) wide each, Two inside lanes: 11 feet (3.4 m) wide each, Catwalk, curb and rail width: 3 feet (0.91 m) on each side. But the long leadups to the anchorages on the Mackinac make its total shoreline-to-shoreline length of five miles (8.0 km), longer than the Akashi-Kaikyo (2.4 mi or 3.9 km). The Algonquian peoples who lived in the straits area prior to the arrival of Europeans in the 17th century called this region Michilimackinac, which is widely understood to mean the Great Turtle. . The design of the Mackinac Bridge was directly influenced by the lessons from the first Tacoma Narrows Bridge, which failed in 1940 because of its instability in high winds. Width of stiffening truss in the suspended span: 68 feet (20.7 m). Between 1936 and 1940, the Authority selected a route for the bridge based on preliminary studies. By 1928, the ferry service had become so popular and so expensive to operate that Michigan Governor Fred W. Green ordered the department to study the feasibility of building a bridge across the strait. The current toll is $4.00 for automobiles and $5.00 per axle for trucks. The length of the bridge's main span is 3,800 feet (1,158 m), which makes it the third-longest suspension span in the United States and 20th longest suspension span worldwide. However, a unique engineering challenge was created by the tremendous forces that operate against the base of the bridge, because the lakes freeze during the winter, causing large icebergs to place enormous stress on the bridge. It is possible that the deck at center span could move as much as 35 feet (east or west) due to high winds.
It remains the longest suspension bridge with two towers between anchorages in the Western Hemisphere. The current painting project began in 1999 and was expected to take 20 years to complete because the lead-based paint needs to be removed, incurring additional disposal requirements. 31 expansion joints allow movement at the length os segments change with the temperature. On June 25, 1958, to coincide with that year's celebration of the November 1957 opening, the United States Postal Service (USPS) released a 3¢ commemorative stamp featuring the recently completed bridge. At the invitation of the state legislature, C. E. Fowler of New York City put forth a plan for a long series of causeways and bridges across the straits from Cheboygan, 17 miles (27 km) southeast of Mackinaw City, to St. Ignace, using Bois Blanc, Round, and Mackinac islands as intermediate steps. Total vehicle crossings, 2005: 4,236,491 (average 11,608 per day).  It is one of only three segments of I-75 that are tolled, the others being the American half of the International Bridge near Sault Ste. Posted on October 14th, 2016. Daniel Doyle fell 60 to 70 feet (18 to 21 m) from scaffolding on August 7, 1997. Chase Osborn, a former governor, wrote: Michigan is unifying itself, and a magnificent new route through Michigan to Lake Superior and the Northwest United States is developing, via the Straits of Mackinac. All suspension bridges are designed to move to accommodate wind, change in temperature, and weight.
The Mackinac Bridge is located on Interstate – 75 in Northern Michigan at the Straits of Mackinac. Some individuals have difficulty crossing bridges, a phenomenon known as gephyrophobia.  In November 1960, sections of I-75 freeway opened from Indian River north to the southern bridge approaches in Mackinaw City, and US 27 was removed from the bridge. The following facts and figures are quoted from David Steinman’s book “Miracle Bridge at Mackinac”. Up until 2017, an exception was allowed for riders of two annual bicycle tours. By then, it was reported that cars queuing for the ferry at Mackinaw City did not reach St. Ignace until five hours later, and the typical capacity of 460 vehicles per hour could not match the estimated 1,600 for a bridge.. At the time, the Straits of Mackinac area was becoming a popular tourist destination, especially following the creation of Mackinac National Park on Mackinac Island in 1875.
The length of the suspension bridge (including anchorages) is 8,614 feet. The Mackinac Straits Bridge Authority was abolished by the state legislature in 1947, but the same body created a new Mackinac Bridge Authority three years later in 1950. , As exploitation of the state's mineral and timber resources increased during the 19th century, the area became an important transport hub. Total length of wire in main cables: 42,000 miles (68,000 km). Total cost estimate at that time was $95 million (equivalent to $739 million in 2019) with estimated completion by November 1, 1956.
Construction, staged using the 1939–41 causeway, took three and a half years (four summers, no winter construction) at a total cost of $100 million and the lives of five workers. Wayne W. Wisbrock smashed into one of the bridge's suspension cables while flying in a heavy fog. This would only happen under severe wind conditions. It is possible that the deck at center span could move as much as 35 feet (east or west) due to high winds. He began the tradition of the governor leading the Mackinac Bridge Walk across it every Labor Day. In 1881 the three railroads that reached the Straits, the Michigan Central, Grand Rapids & Indiana, and the Detroit, Mackinac & Marquette, jointly established the Mackinac Transportation Company to operate a railroad car ferry service across the straits and connect the two peninsulas.  Much longer anchorage-to-anchorage spans have been built in the Eastern Hemisphere, including the Akashi Kaikyō Bridge in Japan (6,532 ft or 1,991 m).
The impact tore the wings off the plane, which then plunged into the Straits of Mackinac. Every Labor Day, the bridge is open to walkers for the Mackinac Bridge Walk. Diver Frank Pepper ascended too quickly from a depth of 140 feet (43 m) on September 16, 1954. The bridge was built under two major contracts. The Mackinac Bridge is currently the fifth longest suspension bridge in the world. G. Mennen Williams was governor during the construction of the Mackinac Bridge.  The Straits area is a popular sailing destination for boats of all types, which make it easier to get a closer view to the underlying structure of the bridge. Save the hassle of packing your belongings time after time and let us be your home away from home. St. Ignace is located at the north end of the Mackinac Bridge. This is one of several designs that Cosgrove has produced for the USPS.  In addition to visitors to Mackinac Island, the bridge has attracted interest from a diverse group of tourists including bridge enthusiasts, bird-watchers, and photographers. It was entitled "Connecting the Peninsulas of Michigan" and 107,195,200 copies were issued. Until 2018, school buses from local districts transported walkers from Mackinaw City to St. Ignace to begin the walk. Because this would have required sinking an anchorage pier in the deepest area of the Straits, the practicality of this design may have been questionable. The road deck is shaped as an airfoil to provide lift in a cross wind, and the center two lanes are open grid to allow vertical (upward) air flow, which fairly precisely cancels the lift, making the roadway stable in design in winds of up to 150 miles per hour (240 km/h). This interpretation of the word is debated by scholars. $2.00 per axle for passenger vehicles ($4.00 per car). , one of the world's longest bridges overall, Learn how and when to remove this template message, "Mackinaw, Mackinac Straits, Mackinac Island", Proposed Mackinac Straits Bridge Preliminary Report, "Michigan Governor Gerhard Mennen Williams", "Mackinac Bridge commemorative token gift packs", "Michigan to Open 35 More Miles of Freeway", "Mackinac Bridge Authority Proposes Raising Tolls to Pay for Renovations", "Why Painting The Mackinac Bridge Is Taking 20 Years", "150 Millionth Vehicle Crosses Mackinac Bridge", "Accident Report Claims Ms. Pluhar Was Speeding", "Reserve Officers Died In Mackinac Bridge Crash", "Investigation Remains Open Following Mackinac Bridge Jump", "Michigan State Police Investigating Possible New Year's Eve suicide on the Mackinac Bridge", "2018 Annual Bridge Walk will start in both St. Ignace and Mackinaw City for safety, convenience", "How can my bicycle group get across the Mackinac Bridge? The bridge connects Michigan’s Upper and Lower Peninsulas. The length from cable bent pier to cable bent pier is 7,400 feet. , At that time, with funding for the project still uncertain, further work was put on hold because of the outbreak of World War II. , The preliminary plans for the bridge featured a 3-lane roadway, a railroad crossing on the underdeck of the span, and a center-anchorage double-suspension bridge configuration similar to the design of the San Francisco – Oakland Bay Bridge.  The bridge authority and MDOT unveiled the stamp, which featured a "seagull's-eye view" of the landmark, with a passing freighter below. The Merritt-Chapman and Scott Corporation of New York was awarded the contract for all major substructure work for $25.7 million (equivalent to $200 million in 2019), while the American Bridge Division of United States Steel Corporation was awarded a contract of more than $44 million (equivalent to $339 million in 2019) to build the steel superstructure..
 It opened to traffic on schedule on November 1, 1957, and the ferry service was discontinued on the same day. In 1920, the Michigan state highway commissioner advocated construction of a floating tunnel across the Straits. The Mackinac Bridge is currently the fifth longest suspension bridge in the world. One worker has died since the bridge was completed.
Depth of stiffening truss: 38.1 feet (11.6 m).  The 50th anniversary of the bridge's opening was celebrated on November 1, 2007, in a ceremony hosted by the Mackinac Bridge Authority at the viewing park adjacent to the St. Ignace causeway..
Includes every Delphi tutorial on the site Height of the roadway at mid-span: approximately 200 feet (61 m) above water level. Construction cost: $99.8 million (equivalent to $708 million in 2019, Height of towers above water: 552 feet (168 m), Max. , At a July 1888 meeting of the board of directors of the Grand Hotel on Mackinac Island, Cornelius Vanderbilt II proposed that a bridge be built across the straits, of a design similar to the one then under construction across the Firth of Forth in Scotland.
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