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Major dual span bridge in the U. S. state of Maryland, spanning the Chesapeake Bay

The Gov. William Preston Lane Jr. Memorial Bridge (informally called the Chesapeake Bay Bridge and, locally, 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 its urban and suburban Western Shore, running between Stevensville and Sandy Point State Park near the capital city of Annapolis. The original span, opened in 1952 and with a length of 4 mile (6 km), was the world's longest continuous over water steel structure. The parallel span was added in 1973. The bridge is named for William Preston Lane Jr., who as the 52nd Governor of Maryland launched its construction in the late 1940s after decades of political indecision and public controversy. The bridge is part of U. S. Route 50 (US 50) and US 301, and serves as a vital link in both routes. As part of cross country US 50, it connects the Baltimore–Washington Metropolitan Area with Ocean City, Maryland, Rehoboth Beach, Delaware, and other coastal tourist destinations. As part of US 301, it serves as part of an alternative route for Interstate 95 travelers, between northern Delaware and the Washington, D. C., area. The bridge is busy and often congested with traffic, particularly during peak hours and summer months. The bridge's role in transportation was filled by ferries before the first span's construction. The bridge has fostered the state's economic growth, particularly of Queen Anne's County and Ocean City. Further expansion of the bridge has been discussed since 2004, with a task force being formed to investigate the possibility of building a third span. The bridge is often confused with the Chesapeake Bay Bridge–Tunnel, a bridge–tunnel linking the Eastern Shore of Virginia with the Hampton Roads region and the rest of Virginia.

It is possible that studies may have been conducted as early as the 1880s into the possibility of a bridge across the Chesapeake Bay. However, the first known proposal came about in 1907 and called for a crossing between Baltimore and Tolchester Beach. In 1927, local businesspeople were authorized to finance the construction of a Baltimore to Tolchester Beach crossing. Plans for the new bridge were made, but construction was canceled following the Wall Street Crash of 1929 with the collapse of the American economy and resulting Great Depression of the 1930s. In 1919, the Claiborne–Annapolis Ferry Company began running ferries between Annapolis and Claiborne, a community near St. Michaels. In July 1930, the Claiborne–Annapolis Ferry Company added a new route, one running from Annapolis to Matapeake, a significantly shorter distance. The auto and passenger ferries were taken over by the State Roads Commission in 1941 (reorganized into today's State Highway Administration of the Maryland Department of Transportation in 1973). Two years later, the commission moved the western terminus of the old Annapolis–Matapeake ferry to Sandy Point (later adjacent to Sandy Point State Park), shortening the cross bay trip. Before the opening, a parade of vehicles made the first official crossing, led by then current Governor Theodore Roosevelt McKeldin, (1900–1974), and other state officials in a distinctive white Cadillac convertible flying huge American and Maryland flags. On November 9, 1967, the bridge was dedicated to Governor Lane, who had died earlier that year, and officially renamed the "William Preston Lane Jr. Memorial Bridge". These included one further north near Baltimore, one in southern Maryland, and an additional span to be added to the existing bridge from Kent Island to Sandy Point; ultimately, the third option was chosen. Construction of the new parallel span began in 1969 to the north of the original bridge, and it was completed on June 28, 1973. Several weather related incidents have caused complete closures of the bridge. The bridge has been closed four times due to extreme weather. The first time was September 18, 2003, during Hurricane Isabel and its high winds. On August 27, 2011, the bridge was closed to all traffic due to the impact of Hurricane Irene. Then Governor Martin O'Malley ordered the bridge closed when sustained winds exceeded On October 29, 2012, the bridge was closed due to the effects of Hurricane Sandy. On March 6, 2013, during the March 2013 nor'easter, high winds again caused the bridge to be closed. On August 10, 2008, a tractor trailer involved in a head on collision near the west end fell from the bridge; the driver died in the crash. The incident highlighted concern that the bridge may not be structurally safe, but the Maryland Transportation Authority (MDTA) discounted any structural or engineering problems with it. Inspections of the wall in the weeks following the accident revealed that there was deterioration in the form of corrosion of the steel reinforcements inside barriers; this prompted immediate repairs to the wall.

With shore to shore lengths of , The bridge's western terminus is in Sandy Point State Park, located northeast of Annapolis in Anne Arundel County, and its eastern terminus is in Stevensville on Kent Island in Queen Anne's County. The two spans are relatively similar in height, with the older span at 354 feet (108 m) and the newer span at 379 feet (116 m).

Traffic patterns on the bridge's five lanes can be adjusted via its lane control system, which consists of overhead lane control signals on both spans and approaches. In April 2013, changes were made to increase safety on the westbound span during two way operations: signs, pavement markings, and rumble strips were modified, and a buffer zone between the left and center lanes was created. As a result, motorists can no longer switch between the left and center lanes, whether or not two way operations are in effect. Two way traffic may occur on the eastbound span during overnight roadwork or during emergency situations that close the westbound span, on which two way traffic is more common. When the MDTA closes either span for overnight roadwork, it implements two way traffic on the span that remains open. During eastbound span closure, two way traffic operates on the westbound span with the center lane closed. In January 2020, Governor Larry Hogan announced that the tollbooths on the eastbound side of bridge were being removed in preparation for all electronic tolling on the Kent Island side of the eastbound bridge. The merged lanes tie directly into the two lanes on the eastbound bridge. The MDTA is replacing lane control signals on both bridges with those that have flashing strobe lights to indicate a lane closure or a lane with contraflow traffic, and is installing an automated gate system on the bridge to allow quicker implementation of two way traffic on the bridge. The automated gate system will reduce traffic congestion when implementing two way traffic. Illuminated pavement markings will be installed to show where the crossovers are during two way traffic operations. MDTA crews will no longer have to manually open and close the crossovers for two way traffic operations. The MDTA has used traffic cones and barrels to open and close crossovers, and to create tapers for the reversible lane. When two way traffic is implemented, the MDTA momentarily stops traffic to reposition traffic cones and barrels to taper traffic into the reversible lane. MDTA Police then escort traffic across the bridge in the reversible lane. The MDTA will not implement two way traffic in certain weather conditions, including excess precipitation and high winds. The MDTA may stop all traffic when the wind speed exceeds 55 mph. Two way traffic on the bridge requires all associated signage and systems to be operational. The MDTA has to monitor two way traffic operations on the bridge due to the length of the bridge and its lack of shoulders. The MDTA will stop two way traffic if westbound delays pile up, at which point westbound traffic will be prioritized. Any time contraflow traffic is implemented on either of the bridges, the speed limit for the contraflow lane is reduced to 40 mph while the other lanes remain at 50 mph. MDTA Police will momentarily stop traffic for MDTA crews to reposition traffic cones and barrels to close off the left lane leading up to the bridge in the event of inclement weather during contraflow traffic. Previously the bridge had a one way (eastbound) toll of $6.00 for two axle vehicles (raised from $4 on July 1, 2013); vehicles with E ZPass that were enrolled in the Bay Bridge Commuter Plan paid $2.10 (raised from $1 on July 1, 2013). Tolls were collected in both directions until April 1989, when tolls were doubled and only collected in the Eastbound direction. All electronic tolling began on May 12, 2020, with tolls payable through E ZPass or Video Tolling, which uses automatic license plate recognition. The MDTA previously provided transportation across the bridge for nervous drivers, but that role is now filled by private companies.

While there are no pedestrian facilities on the bridge, the Bay Bridge Walk and Governor's Bay Bridge Run used to afford an opportunity to cross the bridge on foot, usually on the first Sunday in May. The events took place on the eastbound span, which was closed to vehicles while two way traffic shared the westbound span. Participants started on the east end of the bridge (on Kent Island) and proceeded west to the finish near the toll plaza. WMATA and MTA transit buses transported participants between outlying parking areas and the start and finish points. The run, a 10K race across the bridge, is held early in the morning before the walk. It is conducted by the Annapolis Striders, a local running organization, and controlled by the MDTA and Maryland Department of Natural Resources. Proceeds went to the Chesapeake Bay Trust in support of the bay. The first walk was held in 1975, when a Towson Boy Scout leader asked Governor Marvin Mandel if his troop could walk across the bridge during maintenance. 2003 and 2005 due to security concerns. Fiscal concerns were also cited as a contributing factor to the 2010 cancellation. 2011 due to fiscal concerns. 2012 for undisclosed reasons. Following its cancellation in 2005, the MDTA considered decreasing the annual frequency of the event, citing traffic, fiscal, manpower, and security concerns. The most recent event (held in 2006) cost over $350,000, and the cost estimate for 2012 was almost $400,000. In late 2011, a non profit group, the Greater Washington Sports Alliance (GWSA), approached the MDTA Capital Committee to propose sponsoring the event, along with a concert at Sandy Point State Park, at no cost to the MDTA. While the Capital Committee unanimously recommended that the MDTA Board approve the proposal contingent upon an agreement between the GWSA and the MDTA, the 2012 event was ultimately cancelled. After increasingly consistent cancellations of the walking event, the MDTA, along with Queen Anne's County, contracted with an outside company to have a professional 10K race across the bridge, which has been labeled the "Across the Bay 10K". The inaugural event occurred November 9, 2014. The Race Director is Dave McGillivray, who has served in that capacity for the BAA Boston Marathon since 1988. The Across the Bay 10K has several charity beneficiaries, including bay research, bay restoration, and breast cancer research. The IRONMAN Foundation took over the race's organization in 2016. In 2019, the race was held virtually due to maintenance on the bridge.

Since its construction, the bridge has made significant impacts on both sides of the bay; among them has been the growth of Eastern Shore communities. When the bridge opened in 1952, and again when the second span was added in 1973, the Eastern Shore was given easier access to Baltimore and Washington, causing areas in southern Queen Anne's County to develop as bedroom communities. This extension of the Baltimore–Washington suburbs has led Queen Anne's County to be listed as part of the Baltimore–Washington Metropolitan Area. The bridge has also given easier access to Ocean City from the Western Shore, which has caused Ocean City to grow from a small town to one that is said to become the second largest city in Maryland during the summer. In 1948, the impending completion of the bridge gave rise to an extension of US 50 to Ocean City. The route was extended along the corridor of Maryland Route 404 (MD 404) and a large portion of US 213, cutting both of those routes back. During the 1950s, US 50 on the Western Shore was rerouted onto the long proposed Annapolis–Washington Expressway (now known as the John Hanson Highway), which was built at the time in order to provide better access to the bridge. As the Eastern Shore, particularly Ocean City, grew, further upgrades and realignments of US 50 took place. This work included the aforementioned 1973 completion of the second Bay Bridge span, the extension of the US 50 freeway eastward to the US 50/US 301 split in Queenstown, and the construction of a freeway bypass around the north side of Salisbury in 2002. Additionally, the road has been upgraded and realigned over the years from its original two lane configuration to a four lane divided highway, with the last such section being in Vienna, bypassed in 1991. Previous plans to expand US 50's freeway portion and replace the aging Harry W. Kelley Memorial Bridge into Ocean City have been delayed. The bridge is often the site of suicides by jumpers. As of 1995, more than 75 people had committed suicide during the bridge's 43 year existence.

In December 2004, a study concluded that traffic across the bridge was expected to increase by 40% by 2025. The following year, a task force formed by Governor Bob Ehrlich met to again explore the possibility of establishing a new Chesapeake Bay crossing. The task force concluded that a bridge would be the best option for an additional crossing, and four geographic locations for such a bridge were explored: Anne Arundel County to Queen Anne's County (the existing location), Baltimore County to Kent County, Anne Arundel or Calvert County to Talbot County, and Calvert County to Dorchester County. In late 2006, the task force released a report on the study but did not make a final recommendation; members of the task force requested additional time to continue the study. In 2020, it was announced that 11 of 14 potential sites for a third span had been rejected by the Maryland Transportation Authority following a $5 million study into the impacts of an additional span. Significant environmental and economic impacts were identified, with a report stating that any additional crossing is "expected to be multiple billions of dollars."