Staustufe Lehmen, River barrage system in Lehmen, Germany.

Staustufe Lehmen is a barrage and lock complex on the Moselle River designed to regulate water flow and enable river navigation. The existing chamber spans approximately 170 meters long and 12 meters wide, with a power generation facility integrated into the structure.

The barrage was completed in 1961 and established a key water management system on the Moselle River. Subsequently, construction of a second, larger lock chamber was initiated to accommodate heavier vessel traffic.

The lock is named after Lehmen, the village on the left bank; the opposite bank belongs to Niederfell. The Moselle kilometre 20.76 marker fixes its position on the waterway, and the 16.35 km stretch of impounded river behind it is called a Haltung. The adjacent run-of-river plant, built in 1962, is run by RWE Generation Hydro.

The barrage lies at Moselle kilometre 20.76 between Lehmen and Niederfell, with the lock and boat lock on the river beside the bank. The stretch held back by the weir runs 16.35 km upstream, so the water level changes only at the structure itself. The lock chamber is 170 by 12 metres and the boat lock 18 by 3.2 metres.

A second lock chamber measuring about 210 meters long is currently under construction to handle heavier cargo barges in the future. This reflects the ongoing adjustment of the infrastructure to meet growing transportation demands.