Bridge before turning to the south to join Bow Brook. This continues through woodland, and passes over a weir at Tumbling Bay, to reach Beaurepaire Mill. The square mill building was built in the 1870s or 1880s for the Beaurepaire estate, but has now been converted into a house. The rather larger mill house dates from the same time, although it was extended in the 20th century. The river continues beneath a bridge dated 1831, which consists of five elliptical cast-iron girders supporting plates on which the roadway is constructed. The balustrades are made of wrought iron, and the abutments are of brick and stone. Shortly afterwards, the river is crossed by the course of another Roman road, and passes beneath Lock's Bridge to enter Bramley Training Area. This was the Bramley Ordnance Depot between 1917 and 1987, when it was used to store ammunition, and was also the home of the Royal Army Ordnance Corps School of Ammunition from 1922 to 1974. The channel splits into two, and joins up again after both routes have passed under the Great Western Railway line connecting and , which bisects the training area. The depot had its own internal standard-gauge railway network, which crossed Bow Brook four times to the west of the main line railway, and another four times to the east. The Brook then curves around the southern edge of a mound on which the earthworks for Bulls Down Camp stand. This was an Iron Age hillfort, covering , which has never been excavated archaeologically, and is a scheduled monument. The river then passes along the north-western edge of Sherfield on Loddon, passes a sewage treatment works on its right bank, and joins the Loddon. Vyne Stream is a tributary of Bow Brook, which rises from springs in the south-easterly part of Sherborne St John. It passes under Vyne Road, and forms a large pond, known as Mill Head. Wey Brook, which rises from springs on both sides of the A340 road to the north-west of Sherborne St John, supplies water to watercress beds and flows eastwards to join Mill Head. Its outflow powered a watermill, beyond which the river turns to the north and passes a sewage treatment works on the right bank. It then enters The Vyne, a large area of parkland which was recorded as having a manor house and chapel in 1362. It was inherited by