Seedamm, Artificial causeway in Schwyz and St. Gallen, Switzerland

The Seedamm is an artificial embankment structure with two bridge segments connecting Rapperswil and Hurden across the narrowest point of Lake Zurich. The roughly one-kilometer-long causeway carries both road traffic and railway tracks simultaneously.

A wooden bridge stood here from 1360 as part of the pilgrimage route to Santiago de Compostela. In 1878 it was replaced by the stone causeway that exists today.

The name refers to the artificial embankment that joins two shores. Today visitors cross it mainly for transportation, experiencing it as an everyday route rather than a ceremonial passage.

The causeway is accessible on foot or by car via the main road, though there are few stopping points along the way. The best views of the structure and surrounding water come from the adjacent shoreline areas.

The Hurden ship canal was cut through the base of the Hurden peninsula in 1942/43, turning the village of Hurden into an artificial island. The Sternenbrücke carries both road and railway over it, and the main shipping channel between the lower lake and the Obersee now passes through this cut rather than under the Seedamm bridges.