A MOTHER and three boys are dead following a single-vehicle crash in the Riverina.

NSW police says that at about 11.15pm on Tuesday emergency services respond to reports that a vehicle had crashed into a pole and then deflected down an embankment into a water channel and fell on to its roof at the intersection of Research Road and Toorak Road, Yanco – about 7km south of Leeton.

The 36-year-old woman and three boys, aged 10, 11 and 12, who are all related to one another, died at the scene before the arrival of emergency services.