The bridge was part of Canadian politician William Hamilton Merritt's vision to promote trade within his country and with its neighbor the United States. Many argued that a suspension bridge could not support the safe passage of trains, including bridge builders. Nonetheless, the bridge companies hired Charles Ellet, Jr., who laid a line by a kite across the chasm and built a temporary suspension bridge in 1848. Ellet left the project after a financial dispute with the bridge companies, who hired John Augustus Roebling to complete the project. By 1854, his bridge was nearly complete, and the lower deck was opened for pedestrian and carriage travel. On March 18, 1855, a fully laden passenger train officially opened the completed bridge.