A typical road bridge over the Atlantic would be nearly difficult to build, prohibitively costly, and completely unworkable. The greatest challenge for building is the Atlantic's enormous depth. Even the deepest non-floating oilrigs do not penetrate deeper than 550 meters. Thus, a bridge structure must be able to withstand extreme depths of up to 4,500 meters or more.
The best option for crossing an ocean is undoubtedly one of its own continents. By joining two separate countries together, you can create a land bridge that connects them in order to provide access for trade and travel. A few examples of such bridges are the Golden Gate Bridge connecting San Francisco to Marin County on the United States' Northern California coast; the Pont des Arts between Paris, France, and Saint-Germain-en-Laye, France; and the Brooklyn Bridge linking New York City to Brooklyn, New York.
However, a bridge does not need to connect two cities together to be considered important. Many smaller bridges also play an integral role in their regions by providing crossings where other roads cannot go. Some examples include the Humber Bridge over the Humber Estuary in England and Ireland's Connemara Island Bridge, which crosses from County Galway into County Mayo. These small bridges help transport goods and people between locations that might not otherwise have been able to communicate with each other.
At today's rates, Evergreen Point would cost at least $127 million. So, to put it simply, a bridge over the Atlantic would cost $127 billion. In actuality, it would be significantly higher due to the necessity to make it strong enough to endure the elements at sea and disconnect if required. To be cautious, we double the amount by ten, which is $1.27 trillion. This is more than the entire value of all the stock traded on the New York Stock Exchange at the time.
The original estimate was made in 1672 by English mathematician William Rowan Hamilton who estimated that the cost of building a bridge between Ireland and England would be £20,000 ($327,500). Today, that number has increased to around $130 million.
Evergreen Point was proposed as a joint project by the governments of Canada and Nova Scotia in 2005. If built, it would be the first fixed link bridge across the Atlantic Ocean. It would connect Halifax with Trout River, near King's Landing County Park in Nova Scotia. The idea came after several attempts were made to build a tunnel under the ocean floor between Ireland and England, but they were all rejected because they would have been prohibitively expensive.
Evergreen Point contains three large towers each standing well over 400 feet high. The main tower at the center will be nearly half a mile tall making it the second tallest structure in Nova Scotia (after Sears Tower in Chicago) and in all of Atlantic Canada. It is expected to be completed by 2015 if funding can be found.
Building a bridge over the Bering Strait would be prohibitively expensive, even if there are a handful of islands in the center (the Doimedes) that would reduce the cost to around $105 billion (5 times the price of the English Channel tunnel). The total area of the Straits is only 160 square miles, so the cost could reach $150 million per mile.
The shortest route between Asia and America is by way of the Bering Strait. It connects the Pacific Ocean with the Arctic Ocean. A bridge or tunnel could connect the two continents, but it would need to be quite large because the land masses are uneven: Russia has more than twice as many people as America, but its territory is four times larger.
Both the Russian and American governments have talked about building bridges or tunnels across the strait, but nothing has come of it yet. The problem is that they are very expensive projects: the proposed bridge would need to be wide enough for ships to pass under it, which means it would have to be at least 1 mile wide, which would make it quite expensive. The same thing can be said of building tunnels instead of bridges. There have been recent studies done on constructing a bridge or tunnel from both America and Russia, but neither government has come up with any money to support such projects.
Most bridges need extensive planning, especially when they are placed across a river that is overseen by many government bodies. It doesn't have to be a major river for many governmental organizations to claim authority over the rights to develop anything along the waterway. The more agencies with a say in the matter, the longer and more complicated the process will be. When building a bridge over a river, consider all of these organizations before starting work.
Bridges can be built for many reasons, most commonly to provide a means of crossing a body of water or to provide access to another location. There are several different types of bridges out there, each with their own advantages and disadvantages. A few common ones include:
Railroad bridges - These bridges are primarily used by trains but also serve as an effective way of crossing large bodies of water. They are usually made up of several sections that are tied together under the weight of the vehicle. This type of bridge is expensive to build and maintain.
Road bridges - Also known as "stretch bridges", these structures allow vehicles to pass over them. They come in two main varieties: single-lane bridges and multiple-lane bridges. Single-lane bridges are generally cheaper to build than multiple-lane bridges but cannot handle as many vehicles as their more expensive counterparts.