East of Highland Creek is Port Union, named after a port facility that existed there from 1832 to 1873. The community was centred on the Adams Creek which was the site of a local ship builder who worked for the local merchants in the area which also had a winter harbour up the mouth of the Rouge River Valley. The little harbour disappeared in the late 1870s with the arrival of the Grand Trunk Railway. The railway built a causeway, as part of a bridge project, filling in part of the river, irreversibly changing the mouth of the Rouge River, negatively impacting the local environment. Remedial efforts began in 2001 to reverse the changes in the local environment, although the bridge and causeway remains. East of Port Union is West Rouge, Toronto's easternmost neighbourhood. The eastern terminus of Lawrence Avenue is situated near the southeast portion of West Rouge's waterfront.
