a dam to be built between Hopewell Cape and Fort Folly Point. The company sold shares to raise funds for the project and a series of on-site and airborne studies were conducted by the federal government, but the project fell through by 1928. As rail transport became more common, it displaced river transportation around the Great Depression. In addition, the Greater Moncton International Airport offered an airmail service from Moncton to Montreal by 29 December 1929. These factors further marginalised the Petitcodiac. The Gunningsville Bridge, which crosses the Petitcodiac River to link Moncton and Riverview, was built in 1867. It was damaged and rebuilt on four different occasions. The first was following the Saxby Gale of 1869, which forced the town to rebuild the bridge in 1872. It went under "extensive repairs" mid-1892, but ice build-up from the Petitcodiac continued to pose a threat for the wooden structure, leading to the construction of a new steel version from 1915 to 1919. This fourth bridge would suffer through many collisions, including one with the Mayflower in September 1929, which caused the ship to capsize and drown two men. The Gunningsville Bridge would last 86 years before it would be demolished a final time, making way for a four-lane bridge crossing. Covered bridges were also built over the Petitcodiac River, the final extant one being "Hasty", built in 1929. Causeway Controversy (1968–present) In 1968, the provincial and federal governments completed the construction of a causeway between the communities of Moncton and Riverview, to provide a crossing over the river, and to keep water levels from impeding agricultural production. This was a benefit for the federal government at the time, which had constantly maintained the dykes in the area. It also benefited the provincial government, as the federal government was willing to fund the $3 million project, but not a bridge. Although the causeway was equipped with a fishway, problems arose when fish were unable to cross it freely due to sedimentation build-up; some 82 percent of the salmon were prevented from travelling upstream by the structure. The sediment accumulated in the of river downstream from the causeway, with over 10 million cubic metres (13 million cubic yards) of silt deposited in the first three years following construction. Several reports from 1969 to 1971 described its impact on the aquatic ecosystem, and proposals for amendments to the causeway gates were released, but no