The river is joined by the River Jordan on the east bank and Wattisham Watercourse on the west bank. To the east of Needham Market is Hawks Mill and Needham Lock. The lock is at the upstream end of the mill bypass channel. The present mill building was constructed in 1884. Although it still contains a working Armfield water turbine, all of the internal machinery has been removed. The road in front of it is supported by an eighteenth-century bridge. Just to the east are the remains of a post mill, originally built further north, but moved to its present location in 1880, and used as a dovecote. It is thought to be the last example of its type in the country. Needham Market sewage works is located on the east bank of the river, while to the west are some former gravel pits, which have been landscaped to become part of the Needham Lake park. The park spans the river, and parts of it are a designated local nature reserve. The river splits into two just to the north of the B1078 bridge, with the River Gipping to the east and the Old River to the west. Bosmere lock is located below the bridge, and the four-storey timber-framed and weatherboarded mill building was used as a restaurant, but subsequently converted to private flats. The iron breast-shot water wheel remains, but the machinery does not. It was formerly called Barking Road Mill or Quinton's Mill, as there was a Bosmere Mill some further downstream.