With a price tag of at least $1.5 billion, the Jiaozhou Bay bridge is 2.5 miles longer than Louisiana's Lake Pontchartrain Causeway
The Jiaozhou Bay bridge is 26.4 miles long, according to Guinness World Records. It links China's eastern port city of Qingdao to Huangdao island.
State-run CCTV said the 110-foot-wide bridge cost more than 10 billion yuan ($1.5 billion). However, the Xinhua news agency put the cost at $2.3 billion and Britain's Telegraph newspaper reported its price tag totalled more than $8.8 billion.
CCTV said it passed construction appraisals on Monday. The bridge and an associated undersea tunnel opened to traffic on Thursday.
The bridge, which is supported by more than 5,000 pillars, took more than four years to build.
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According to the Guinness World Records, the previous longest bridge over water was the Lake Pontchartrain Causeway in Louisiana. The Chinese bridge is more than 2.5 miles longer.
"The earthquake- and typhoon-proof bridge ... is designed to withstand the impact of a 300,000-ton vessel," Guinness said.
Xinhua said the bridge would shorten the journey between Qingdao and Huangdao by about 18 miles, cutting travel time from 40 minutes to 20 minutes.
According to the Telegraph, the bridge was expected to carry more than 30,000 cars a day.
It reported that at least 10,000 people worked in two teams around the clock on the span's construction.
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