Until the middle of the 19th century, the mouth of the Touques served as a grounding port for Trouville-sur-Mer. Its channel, constantly silted up by sea currents parallel to the shore, had to be fitted out and secured by two piers. The works, which lasted from 1846 to 1849, were financed by the municipality of Trouville, the General Council, and the State as well as by a subscription of the sailors and the inhabitants of Trouville. The modification of the sea currents having led to the silting up of Deauville beach and the formation of a zone of sea lanes, the eastern pier was extended in 1858. The two piers were expanded again ten years later to stop, without much success, the permanent silting up of the channel. At the end of the works, the western jetty measured 1,804 ft (550 m), and the 718 ft (219 m) eastern jetty was extended by a 1,312 ft (400 m) cord of rockfill.