RedactedNarrative: V1 struck the bridge fenders, a slow speed zone sign and a concrete piling on the Alt A1A Bridge in the Jupiter, FL. While traveling north on plane in the intracoastal waterway, V1’s port side struck the southeast bridge fender and attached slow speed zone sign. V1 continued north, struck and was ejected over the northeast fender then struck a concrete piling. V1 came to rest between the northeast fender and the concrete piling. The operator of V1 was uninjured. V1's operator did not maintain a proper lookout and was traveling too fast for the conditions.