Boating
The Lahn, from a point between Lahnau and Dutenhofen (Wetzlar) to its confluence the Rhine, is designated as a federal waterway. In this area, it is subject to the Water and Shipping Administration of the federal government, with the responsible office being that at Koblenz.
The middle and lower section of the Lahn is navigable and has a large number of locks. The waterway is used almost exclusively by smaller motor yachts for tourists, as well as paddled- and rowboats. For non-motorized watercraft, the Lahn can be used for the entire length between Roth (of Weimar) and the Rhine.
From the mouth upwards to Dehrn (of Runkel), Lahn-km 70 (above Limburg), the river is consistently passable for larger vessels, with locks operated by personnel. The Water and Shipping Administration guarantees a minimum water depth of 1.60 m in the navigation channel. There are stream gauges at Kalkofen (of Dörnberg) (normal water level 1.80 m) and at Leun. Above Dehrn there are manual locks and frequent shoals, making the passage of boats difficult. Two weirs in Wetzlar are an obstruction to shipping further upriver.
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