The Bob Graham Sunshine Skyway Bridge, commonly known as the Sunshine Skyway Bridge, is a bridge spanning Tampa Bay, Florida, with a cable-stayed main span, and a total length of 21,877 feet (4.1434 mi; 6.668 km). It is part of Interstate 275 (I-275) and U.S. Route 19 (US 19), connecting St. Petersburg in Pinellas County and Terra Ceia in Manatee County, Florida, passing through Hillsborough County waters. Construction of the current bridge began in 1982, and the completed bridge was dedicated on February 7, 1987. The new bridge cost $244 million to build, and was opened to traffic on April 20, 1987. It replaced an older bridge constructed in 1954, which was partly destroyed in a collision in 1980. It is constructed of steel and concrete. Steel cables clad in 84 9-inch (230 mm) steel tubes (42 per pylon) along the center line of the bridge support the main span.