Having turning back toward the west, the Brun falls over one final weir as it joins the River Calder close to the roundabout on Active Way.

[5][4][6] Close to St. Peter's the remains of a weir can still be seen, the water went through a goit (part of which has been preserved) to a lodge for the town's old corn mill located next to the Bridge Inn.

The last crossing before the confluence with the Calder is called Salford,[b] the area of the town that developed around it was also known by that name in the early 20th century.

Previously this section of the river flowed further to the west, with the Don collecting Swinden Water before meeting the Brun close to the mill lodge.

The mine workings caused significant levels of pollution in the river and the diversion scheme also allowed the valley of the old route to be used as a landfill site.