The new weir was created in 1979 when a cut was made through fields on the southern side of the lock.
The area is rich in flora and fauna, and a frequent haunt for otters, kites and kingfishers.
The river winds and doubles back on itself sharply on the short stretch upstream.
Robert Tertius Campbell who bought it in 1859 built a factory to distill alcohol from sugar beet.
The Thames Path follows the northern bank from Buscot Lock to Bloomers Hole Footbridge, where it crosses the river.