[1] They were granted a privilege to purchase and maintain land in the northeastern area of Strand island, where they constructed dikes in the years 1624 to 1628.

The interruption of tidal current by the causeway led to a considerable increase in sedimentation on both side of the dam.

The experience gained from the construction of the Hamburger Hallig dam became influential for the further development of land reclamation in North Frisia.

On this day, Hamburger Hallig was declared a nature reserve to protect the local populations of pied avocets.

Today, Hamburger Hallig, together with the floodplains and salt marshes off the Sönke-Nissen-Koog polder, encompasses an area of roughly 1,000 hectares (2,500 acres) and is maintained by Naturschutzbund Deutschland (NABU).

[2] Modern coastal management protects the west coast of Hamburger Hallig from further erosion.

It is a flat hill without buildings that serves as refuge for cattle and sheep during light floodings of the island.