Blue Water Bridge
Blue Water Bridge
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Blue Water Bridge

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Blue Water Bridge

The Blue Water Bridge is a twin-span international bridge across the St. Clair River that links Port Huron, Michigan, United States, and Point Edward, Ontario, Canada. The Blue Water Bridge connects Highway 402 in Ontario with both Interstate 69 (I-69) and Interstate 94 (I-94) in Michigan. The original span of the bridge opened in 1938, and a companion span opened in 1997.

The original span is a cantilever truss bridge with a total length of 6,178 ft (1,883 m) and a main span of 871 ft (265 m). The second, newer span is a continuous bowstring arch bridge with a total length of 6,109 ft (1,862 m) and a main span of 922 ft (281 m).

The Blue Water Bridges are jointly owned and maintained by Canada and the United States: Federal Bridge Corporation, a Crown corporation of the Government of Canada, is in charge of the Canadian side, while the Michigan Department of Transportation (MDOT) is in charge of the US side. A toll is charged to cross the bridges, which is used to pay for maintenance and operations.

Together, the two bridges connect Chicago and the Midwestern United States with Toronto and the Northeastern United States, one of the four shortest routes of land travel between the US Midwest and Northeast. They are the second-busiest commercial crossing on the Canada–United States border, after the Ambassador Bridge at Detroit-Windsor, and the fourth-busiest overall international crossing in Ontario in terms of total number of vehicles at 4.7 million annually as of 2011. In Canada, they are the third-busiest bridges after the Samuel-De Champlain Bridge in Montreal and the Ambassador Bridge.

The Port Huron–Sarnia Border Crossing connects the cities of Port Huron, Michigan, and Point Edward, Ontario, at the Blue Water Bridge. Both the US and Canada border stations are open 24 hours per day. The US Customs and Border Protection upgraded its inspection facilities in 2011, and Canada Border Services Agency upgraded its facilities in 2012. In 2017, inspectors at Port Huron processed 1,579,646 cars and 826,288 trucks.

A U.S. Port of Entry had been established at the location in 1836, when a license to provide commercial ferry service between Port Huron and what then was known as Port Sarnia. The license was issued to a Canadian man named Crampton who operated a sailboat. In the 1840s, a man named Davenport, also from Port Sarnia, operated a pony-powered vessel. Steam-powered vessels and paddle wheelers soon followed, but the first vessel capable of carrying automobiles did not arrive until 1921.

In 1935, the Michigan Legislature passed a law (Public Act 147 of 1935) creating a State Bridge Commission to finance the design and erection of the main bridge structure of the Blue Water Bridge. In 1937, after plans proposed in 1927 to build a bridge spanning the St. Clair River languished during the Great Depression, the Michigan Highway Commission and the Minister of Highways for Canada hired Ralph Modjeski and Frank H. Masters and their Canadian associates, Charles Monsarrat and Philip Louis Pratley to design and build what would become the Blue Water Bridge. Modjeski, a Polish-born engineer who would become known as "America's greatest bridge builder", served as lead engineer for the project. In developing a design, Modjeski faced obstacles posed by the U.S. Army Corps of Engineers, which sought to ensure that the St. Clair River remain navigable for military and commercial vessels. Bridge construction could not interfere with navigation, bridge builders could not use floating platforms, and the completed span was required to clear the water by 150 ft (46 m).

Originally, Modjeski proposed a mammoth suspension-style bridge with tall towers and massive cable anchorages; however, because of the 150 ft (46 m) vertical clearance requirement for shipping, he opted instead for a cantilevered through-truss design.[citation needed] The commission was approved by the United States Congress in August 1935 (Public Law 411 of 1935). The law permitted the commission to sell bonds that would be repaid by the revenue from the tolls ($0.25 toll for travelers) collected within 30 years. The first bridge was fully opened to traffic on October 10, 1938. This bridge originally had two lanes for vehicles as well as sidewalks.

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