Écluse de Kembs-Niffer, Navigation lock in Kembs, France

The Écluse de Kembs-Niffer is a navigation lock in Alsace that connects the Rhine River to the Rhone Canal. The structure includes a control tower and administrative building featuring geometric concrete shapes and a distinctive hyperboloid-style roof.

The lock was inaugurated on 15 April 1961 by Finance Minister Wilfrid Baumgartner, with only Le Corbusier's control tower finished; the administrative building followed in 1962. The chamber measures 85 by 12 metres, widened from the planned 40.5-metre Freycinet lock after Mulhouse pushed for a Rhine harbour. The tower and administrative building were listed as monuments historiques on 11 March 2005.

The lock reflects Le Corbusier's belief that practical functions and artistic design can work together in the same space. Its concrete forms and distinctive roof shape show how technical needs can become part of the visual design.

The lock lies at the eastern end of the Rhine-Rhone Canal where it meets the Rhine side canal, on the Kembs side; the older Le Corbusier lock stands a few hundred metres upstream of the 1995 Niffer lock. The two buildings are fenced off and still await renovation, so they are seen from outside only. The old chamber is still operated, remotely from the new lock, mainly for pleasure boats in summer.

The lock's two outer buildings were designed by Le Corbusier after engineers from Mulhouse approached his Paris studio in spring 1960; he told them he was surprised, as the Ponts et Chaussées rarely commissioned him. The control tower has two offset cube-shaped closed rooms on its shaft and a triangular control room reached by an outside staircase.