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.?

Context paragraphs:
Western Shore of Maryland: Maryland's Western Shore (not to be confused with Western Maryland) is an area of Maryland west of the Chesapeake Bay.  Originally, it included all areas not on the Eastern Shore and some colonial and later state government functions were administered separately for each region.  The term no longer identifies an official region of Maryland and is used in contrast to the "Eastern Shore", which has long had a distinct historical, cultural, sociological, and economic character and sense of personality, well known in American and state history, politics and events, especially before the 1952 construction of the Gov. William Preston Lane Memorial Bridge (Chesapeake Bay Bridge).

U.S. Route 50 in Maryland: U.S. Route 50 (US 50) is a major east–west route of the U.S. Highway system, stretching just over 3000 mi from Ocean City, Maryland on the Atlantic Ocean to West Sacramento, California.  In the U.S. state of Maryland, US 50 exists in two sections.  The longer of these serves as a major route connecting Washington, D.C. with Ocean City; the latter is the eastern terminus of the highway.  The other section passes through the southern end of Garrett County for less than 10 mi as part of the Northwestern Turnpike, entering West Virginia at both ends.  One notable section of US 50 is the dual-span Chesapeake Bay Bridge across the Chesapeake Bay, which links the Baltimore–Washington metropolitan area with the Eastern Shore region, allowing motorists to reach Ocean City and the Delaware Beaches.

Clement C. Clay Bridge: The Clement C. Clay Bridge (CC Clay Bridge or Whitesburg Bridge) are two bridges that span the Tennessee River just south of Huntsville in northern part of the U.S. state of Alabama.  Both bridges are cantilever truss types.  The original bridge span was built in 1931 replacing Whites Ferry which crossed the river at nearby Ditto's Landing.  The second span was constructed in 1965.  Upon completion, the newer span carried southbound traffic while the original span carried northbound traffic.  The Clay bridge was named after former Alabama Governor and Senator Clement Comer Clay.

Salisbury–Ocean City–Wicomico Regional Airport: Salisbury-Ocean City: Wicomico Regional Airport (IATA: SBY, ICAO: KSBY, FAA LID: SBY) , or, more succinctly SBY Regional Airport, is located in unincorporated Wicomico County, Maryland, 5 mi southeast from downtown Salisbury, Maryland, United States.  Salisbury is the largest city of Maryland's Eastern Shore with a population of 125,200 in the metro area.  As the only commercial airport on the Delmarva Peninsula, Salisbury also serves Delaware, the Eastern Shore of Virginia, and the Eastern Shore of Maryland, which include the other large cities of Ocean City, Cambridge, and Easton.  Currently, the General Airport Management is headed by manager Dawn Veatch.

Sellwood Bridge: The Sellwood Bridge is a deck arch bridge that spans the Willamette River in Portland, Oregon, in the United States.  The current bridge opened in 2016 and replaced a 1925 span that had carried the same name.  The original bridge was Portland's first fixed-span bridge and, being the only river crossing for miles in each direction, the busiest two-lane bridge in Oregon.  The Sellwood Bridge links the Sellwood and Westmoreland neighborhoods of Portland on the east side with Oregon Route 43/Macadam Avenue on the west side.  At its east end it leads to Tacoma Street.  The bridge is owned and operated by Multnomah County.  The original span of 1925 was a steel truss bridge, while its 2016 replacement is a deck-arch-type bridge.

Colonial Beach, Virginia: Colonial Beach is a town in Westmoreland County, Virginia, United States.  The population was 3,542 at the 2010 census.  Possessing the second-largest beachfront in the state, Colonial Beach was a popular resort town in the early to mid-20th century, before the Chesapeake Bay Bridge made ocean beaches on the Eastern Shore of Maryland more accessible to visitors from Washington, D.C. The family of Alexander Graham Bell maintained a summer home in Colonial Beach, the Bell House, which still stands today.  Sloan Wilson, author of "The Man in the Gray Flannel Suit", retired and died in Colonial Beach.  George Washington, the first President of the United States, was born near here at what is now the George Washington Birthplace National Monument.  s of 2011 , the James Monroe Family Home Site, birthplace of President James Monroe, now has a small monument to him.

Chesapeake Bay Bridge: 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.

Low Level Bridge (Edmonton): The Low Level Bridge is a bridge that spans the North Saskatchewan River in Edmonton, Alberta, Canada.  Completed in 1900, this was the first bridge across the North Saskatchewan River.  A railway track was added in 1902 to accommodate the Edmonton, Yukon and Pacific Railway (amalgamated with the Canadian Northern Railway in 1905).  Streetcars used the bridge (on a gauntlet track) from 1908 to 1939.  Trolley buses used the bridge from the removal of the streetcar track in 1939 until 1965.  Originally known simply as the Edmonton Bridge, the bridge became known as the Low Level Bridge some time after the completion of the High Level Bridge.  In 1948 a twin span was added to the south of the original span.  The railway track was removed from the original span in 1954.

Comstock's Bridge: Comstock's Bridge, also known as the Comstock Covered Bridge, is a covered bridge located in East Hampton, Connecticut.  The bridge was built in 1840 to span the Salmon River, and is one of only three historical covered bridges in the state.  The main span is a Howe truss, 80 ft long, with a roadbed 12 ft wide.  A secondary span, 30 ft in length, connects the bridge to the eastern shore.  The bridge underwent major restoration work in the 1930s after a truck crashed through the floor; it is now closed to traffic, and is accessible from a small public park.

Aqueduct Bridge (Clay City, Indiana): Aqueduct Bridge, also known as the Coffey Bridge and Clay County Bridge # 182, is a historic Pratt through truss and Pratt pony truss bridge located in Perry Township and Sugar Ridge Township, Clay County, Indiana.  The original span was built by the Cleveland Bridge and Iron Company in 1880 and the second section by the Vincennes Bridge Company in 1920.  It carries Towpath Road over Birch Creek.  The original span measures 60 feet long and the second span 102 feet long.  They rest on concrete abutments and a central pier.

Supporting paragraphs: Colonial Beach, Virginia Chesapeake Bay Bridge
Answer: 4.3 mi