Swedish fortress of Neumünde on the right bank, designed in a Dutch style by General Rothenburg in 1641, replaced the ruined Dünaburg Castle by 1680.

On August 1, 1608 the fortress was taken by the Swedes under Count Frederick Joachim von Mansfeld who renamed it Neumünde ("new mouth").

By 1653 a map issued by Swedish Military council showed that the Dünamünde fortress was destroyed and the Daugavgrīva castle was in ruins.

[1] On August 10, 1710 fortress was taken by the Russians, when Commander Carl Adam von Stackelberg surrendered to general field marshal Boris Sheremetev after being assured of free escort for his troops.

In accordance with terms of the treaty of Nystad (1721) Daugavgrīva fortress remained under Russian rule until Latvia's independence in 1918.

Since the beginning of 2014, a local non-governmental organization Bolderaja Group has been actively involved in the revival and management of the fortress.