Weir And Fish Lock To North East Of Old Fish Locks House

The weir and fish lock, located to the north-east of Old Fish Locks House, dates from the mid-18th century and is believed to have been constructed by William Emerson of Hurworth. It features large, roughly squared sandstone blocks that span the River Tees, forming a curving weir approximately 50 metres long. The fish lock is made of dressed stone. In the late 19th century, the height of the weir was reduced by about 0.75 metres. Originally, there were two fish locks built partly into the riverbank at either end of the weir; however, the west lock has been destroyed. The east lock is a small square-plan structure with round archways on both the upstream and downstream sides, and it is said to contain a stone fish ladder. This structure lies across the parishes of Low Dinsdale and Over Dinsdale, as well as the county border with Durham.