There's Tommy Thompson Park, which has three cells that were developed to handle dredge material from the harbour and from cleaning out Keating Channel. Cell one was filled; they capped it and created a wetland in there. There has been restorative work on other areas in Humber Bay and different areas along the waterfront to help bring back some of the lost wetlands that were originally there in Toronto before they filled them all in.
On April 8th, 2014. See this statement in context.