Q: In this task, you are given a context paragraph, a question based on that and corresponding answer of a question. Your task is to generate supporting fact/knowledge from context paragraph which helps in answering a given question.
The Chesapeake Bay Bridge (commonly known as the "Bay Bridge") is a major dual-span bridge in the U.S. state of Maryland. Spanning the Chesapeake Bay, it connects the state's rural Eastern Shore region with the urban Western Shore. The original span, opened in 1952 and with a length of 4.3 mi , was the world's longest continuous over-water steel structure; the parallel span was added in 1973. The bridge is officially named the "Gov. William Preston Lane Jr. Memorial Bridge" after William Preston Lane Jr. who, as the 52nd Governor of Maryland, initiated its construction in the late 1940s finally after decades of political indecision and public controversy. Question: What was the length of the original span of the bridge which made ocean beaches on the Eastern Shore of Maryland more accessible to visitors from Washington, D.C.? Answer: 4.3 mi
A:
The original span, opened in 1952 and with a length of 4.3 mi , was the worlds longest continuous overwater steel structure; the parallel span was added in 1973.