Chacao Channel bridge, Suspension bridge under construction over the Chacao Channel, Los Lagos Region, Chile.

The Chacao Channel bridge is a suspension bridge under construction between Pargua on the mainland and Chacao on Chiloé Island, in Chile's Los Lagos Region. Its design has four lanes, a total length of 2,635 m and three concrete towers over 180 m tall, with spans of 379, 1,055 and 1,100 m. It is planned to open in the second half of 2028.

Congressman Félix Garay first proposed a bridge between Pargua and Chacao in the mid-1960s, inspired by the Golden Gate and estimated at US$80 million; a 1972 law backed the crossing, but the 1973 coup shelved it. Revived in the 1990s, the project was cancelled in 2006 by Michelle Bachelet's government and reactivated by Sebastián Piñera in 2012. Construction of the current design began in 2017, with opening planned for the second half of 2028.

The bridge takes its alternate name, Chiloé Bicentennial Bridge, from Chile's 2010 bicentennial commemorations. Its 2006 cancellation by Michelle Bachelet's government caused local anger: the mayor of Castro displayed a Spanish flag in protest, and congressman Gabriel Ascencio resigned as head of his party's congressional caucus.

The bridge is not yet open: construction started in 2017 and the opening is planned for the second half of 2028. Until then, the crossing between Pargua and Chacao is still made by ferry, which takes about half an hour; the bridge is designed to cut that to two or three minutes at over 100 km/h.

The bridge is designed to withstand winds over 200 km/h and earthquakes up to magnitude 10, though vehicle traffic would be suspended in such conditions. Its planned 100-year service life reflects the demands of a channel crossed by strong currents.