Blackton Reservoir is a reservoir in County Durham, England. It is situated in Baldersdale, about 4 mi west of Cotherstone, where the River Balder joins the River Tees. It is owned by Northumbrian Water and supplies water for Teesdale. Blackton has a surface area of 25 ha, an average depth of 7.9 m, a catchment area of 3,374 ha and it lies at 285 m above sea level. Blackton is one of a series of reservoirs on the same stretch of the Balder, located immediately downstream of the larger Balderhead Reservoir and being almost continuous with Hury Reservoir further downstream.