Title: Tappan Zee Bridge (2017–present)
Content:  The project timeline originally indicated that the old bridge would be closed in 2016 and that the demolition of the old bridge would begin in February 2017. The new northbound/westbound span opened on August 26, 2017. Southbound/eastbound traffic remained on the existing span until October 6, 2017, when it was shifted to the new northbound/westbound span to allow for the completion of the new southbound/eastbound span. The northbound/westbound span of the new Tappan Zee Bridge temporarily carried four lanes in both directions until the new southbound/eastbound span was completed. After some delays, the project was later expected to be completed by June 15, 2018, at a cost of 
Title: New York State Thruway
Content:  issued a report in October 2011 designating the Tappan Zee's replacement to be a dual-span twin bridge. Construction officially began in October 2013, with the new spans being built to the north of the existing bridge. The new bridge connects to the existing highway approaches of I-87 and I-287 on both river banks. The northbound/westbound span opened on August 25, 2017. Southbound/eastbound traffic remained on the old bridge until October 6, 2017. At that point, southbound/eastbound traffic shifted to the westbound span of the new bridge and the old bridge closed. The bridge's eastbound span opened to traffic on September 11, 2018. Upon completion, the new Tappan Zee Bridge became one of the longest cable-stayed spans in the nation.
Title: Tappan Zee Bridge (1955–2017)
Content:   The northbound/westbound span opened on August 25, 2017. Southbound/eastbound traffic remained on the old span until October 7, 2017, when it was temporarily shifted to the newer northbound/westbound span. The old bridge was subsequently decommissioned. The replacement bridge project was expected to be completed by June 15, 2018 at a cost of $3.98 billion. After some delays, it was announced that the new southbound/eastbound span would open to traffic on September 8, 2018. However, the opening of the new eastbound span was delayed when a piece of the old bridge came loose on September 7 while being demolished. The eastbound span, which was 160 ft away from the old bridge, remained closed until the old bridge could be stabilized. The old bridge was then demolished in piecemeal fashion in order to minimize impacts on the Hudson River's 
Title: Tappan Zee Bridge (2017–present)
Content:  The New York Metropolitan Transportation Council added the Tappan Zee Bridge to its list of projects eligible for federal funds in August 2012. The United States Department of Transportation approved the plan on September 25, 2012. The approval process took fewer than 10 months as opposed to the traditional multi-year process as a result of being placed on a "fast track" for approval by the Obama Administration. On December 17, 2012, New York state officials dropped their proposal for a 45 percent increase on the state Thruway toll for trucks, while advancing a $3.14 billion project to replace the bridge. The project was funded through a public-private partnership. Construction began as scheduled in October 2013, with completion targeted for 2017. TZC, the contractor, was composed of several design, engineering, 
Title: Tappan Zee Bridge (2017–present)
Content:  billion. However, the scheduled opening was later pushed back to mid-September. The new southbound/eastbound span was supposed to open to traffic on September 8, 2018. An opening ceremony was held on that date, but the traffic shift itself was delayed when a piece of the old bridge came loose on September 7 while being demolished. The opening of the eastbound span, which was 160 ft away from the old bridge, was delayed until the old bridge could be stabilized. After the old bridge was stabilized, all lanes were opened on September 11, 2018. The demolition of the old bridge started in November 2017 with the removal of the 
Title: Interstate 87 (New York)
Content:  bridges in metropolitan New York, the Tappan Zee was designed to last only 50 years. The Federal Highway Administration issued a report in October 2011 designating the Tappan Zee's replacement to be a dual-span twin bridge. Construction officially began in October 2013, with the new spans being built to the north of the existing bridge. The new bridge connects to the existing highway approaches of I-87 and I-287 on both river banks. The northbound/westbound span opened on August 25, 2017. Southbound/eastbound traffic remained on the old bridge until October 6, 2017. At that point, southbound/eastbound traffic shifted to the westbound 
Title: Tappan Zee Bridge (2017–present)
Content:  replacement to be a dual-span twin bridge. The new bridge was to be built a few yards to the north of the existing bridge, connecting to the existing highway approaches of the New York State Thruway (I-87/I-287) on both river banks. The New York State Thruway Authority requested design proposals from four companies in 2012 and eventually received three project proposals. The authority awarded a $3.142 billion contract to Tappan Zee Constructors (TZC), whose proposal was not only the least expensive but also promised the shortest construction timeline and included plans to minimize environmental impact. Originally, some motorists thought that bridge tolls 
Title: Tappan Zee Bridge (1955–2017)
Content:  Since the end of the 20th century, calls to replace the aging Tappan Zee Bridge had gone unanswered. The deteriorating structure bore an average of 138,000 vehicles per day by the end of its life, substantially more traffic than its designed capacity. Unlike other major bridges in metropolitan New York, the Tappan Zee was designed to last only 50 years due to material shortages during the Korean War at the time of its construction. In total, the bridge was open for 61 years, 9 months, and 21 days. The new bridge is intended to last at least 100 years without any major repairs. The collapse of 
Title: Interstate 287
Content:  issued a report in October 2011 designating the Tappan Zee's replacement to be a dual-span twin bridge. Construction officially began in October 2013, with the new spans being built to the north of the existing bridge. The new bridge connects to the existing highway approaches of I-87 and I-287 on both river banks. The northbound/westbound span opened on August 25, 2017. Southbound/eastbound traffic remained on the old bridge until October 6, 2017. At that point, southbound/eastbound traffic shifted to the westbound span of the new bridge and the old bridge closed. The bridge's eastbound span opened to traffic on September 11, 2018. Upon completion, the new Tappan Zee Bridge became one of the longest cable-stayed spans in the nation.
Title: Tappan Zee Bridge (2017–present)
Content:  2013. The Left Coast Lifter (one of the world's biggest cranes) was instrumental in the construction of the bridge. The north span officially opened to westbound traffic on August 26, 2017, and eastbound traffic temporarily began using the north span on October 6, 2017. Tappan Zee Constructors then began demolishing the old bridge. An opening ceremony for the south span was held on September 7, 2018, and traffic started using the new span three days later. The bridge's official name, commemorating former New York Governor Mario Cuomo, has been controversial since its announcement. A petition and several pieces of proposed legislation have sought to restore the bridge's name to that of its predecessor.

Question: when is the new tappan zee bridge going to be finished?
Answer: by June 15, 2018.
June 15, 2018.