Because some of the bridges across the river may be under construction, unofficial, small or in disrepair, the exact number of bridges that cross the Mississippi River is difficult to pin down to a single precise number; however, it can be said that there are at least 130 bridges that cross the Mississippi River. The Mississippi River is one of the longest rivers both in the United States and in the world, and the exact length, like the number of bridges, is difficult to determine exactly, and experts in different places will give different estimates. Looking at some of the different expert estimates, it can be said that the Mississippi River is more than 2,300 miles in length.
There are several large cities that are near or right on the banks of the Mississippi River, and those cities tend to be accompanied by bridges that cross the river. There are large, multi-lane highway bridges that cross the Mississippi River, including the Minnesota Highway 371 Bridge and the Interstate 90 Mississippi River Bridge, which connects Wisconsin and Minnesota. Some of these bridges, such as the Stone Arch Bridge in Minneapolis, date back to the 1800s, while others, such as the Poplar Street Bridge, were built in the mid-to-late 1900s. New bridges across the Mississippi continue to be built in the 21st century.