Cusher River is a river in County Armagh. It is formed by the junction, near Mountnorris, of two small streams (the Creggan and the Blackwater), flows by Tandragee, and joins the River Bann one mile above Portadown.
A short distance south of Portadown is the start of the Newry Canal inland navigation. Here the canal is between two rivers: the Cusher River and the Upper River Bann. The Cusher River supplemented water to the lower part of the system. The Point of Whitecoat is where three waterways meet: the Bann, the Cusher River and the Newry Canal, the first inland canal in the British Isles.
In the 19th century there were many flax mills, as well as mills for flour, oats and cornmeal on the Cusher River in the Tandragee area.
In June 2008, at Tandragee, hundreds of trout and roach died after pollution was released into the Cusher River
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