the government of canada established the toronto harbour commission on may 19, 1911 by an act of parliament. the commission was to manage toronto harbour and waterfront lands in toronto and provide for their improvement. its initial plans included the cleanup of sunnyside beach, and a breakwater from the humber river to bathurst street. in the central core, the commission infilled lands south of harbour street to their current waterfront line. to the east, the commission infilled the lands of the don river marsh, for use as industrial and port lands. the bulk of these works were completed by 1925.