There are public pathways on both sides of the channel for most of this stretch. At Southease there is a swing bridge, designed by Henry E Wallis of Westminster in 1878 and installed two years later, to replace a previous structure slightly further upstream. It consists of three bowspring arches, one fixed and the other two mounted on a central pivot. It was manually operated by a capstan mounted on the movable section, and is a rare example of its type, which are more normally found in docks and industrial areas. In 1988, Parliamentary approval was obtained to fix the bridge in position, as it had not been opened since 1967. The river finally reaches Newhaven, where it splits industrial Denton Island from the mainland. A wooden drawbridge was built in 1794 to carry the coastal road over the river, but this was replaced in 1866, when a cast iron swing bridge was erected in its place. It carried both a road and a tramway, which was used in the construction of the West Quay breakwater, a project which was finally completed in 1889. The tramway was then used to facilitate maintenance of the breakwater, until the tracks were lifted in 1963. A new road bridge, at a higher level and slightly further to the north, replaced the swing bridge in 1974. It is opened regularly for commercial shipping, near to high tide, but as the bridge carries the A259 road, each opening causes significant traffic congestion. Below the bridge, the river becomes the Port of Newhaven, where there is a ferry terminal for sailings to Dieppe in France, a service which has been running since 1847. Finally, the river flows into the English Channel, surrounded on either side by two long breakwater piers. 'Ouse' is a common name for rivers in England, with examples including the Ouse in Yorkshire, and the Great Ouse and Little Ouse in Norfolk, Suffolk and Cambridgeshire. The name may stem from the Celtic word Ūsa, which is in turn derived from the word *udso-, meaning "water". The root of this word is the Indo-European *wed-, from which the modern English words "wet" and "water" also stem. If this derivation is correct, then its name is a tautology, meaning "Water river" or "Wet river". However, the National Rivers Authority stated that the river above Lewes was called the Middewinde historically, while the river from Lewes to the sea was called "The Great River of Lewes", and that the present name is a contraction of Lewes, with which it rhymes.