Rhine water levels drop into negative values, disrupting barge transport and industry

Gauges drop across key river waypoints

Water levels along the Rhine River have dropped into negative figures at several monitoring stations as dry conditions extend into early autumn. According to data from the Federal Waterways and Shipping Administration, gauge marks registered at -29 centimeters in Worms and Emmerich, -15 centimeters in Oberwinter, -6 centimeters in Düsseldorf, and -3 centimeters in Koblenz. At the Kaub bottleneck in the Middle Rhine, readings also slipped into negative territory in recent days, while Cologne measured a level of 40 centimeters on Monday. A negative gauge reading does not indicate an empty riverbed, as the navigable channel remains deeper than the reference point. Forecasts from the Federal Institute of Hydrology indicate that Düsseldorf could see levels decline further to -11 centimeters by the end of the week.

Grounding at Düsseldorf harbor

Low water levels caused a 135-meter German-flagged cargo ship, the Terra 2, to run aground on a sandbank while attempting to leave the port of Düsseldorf on Monday. The vessel was carrying white Mercedes Sprinter vans destined for Rotterdam. A navigation police spokesperson explained that tow boats could not immediately intervene due to the risk of hull damage in the shallow water. To free the ship, crews unloaded several vans to reduce its draft and allow it to refloat without disrupting general river traffic. The cargo remained intact, and the vessel was freed following the operation.

Water inflows and navigation bottlenecks

Hydrological conditions along the catchment area have curtailed commercial barge traffic, particularly on the Middle Rhine between St. Goar and Mainz. Low precipitation has reduced river volume to a fraction of normal seasonal flows, leaving vessels dependent on limited natural and artificial sources. Florian Krekel from the Bingen Waterways and Shipping Office detailed the sources currently sustaining river flows.

At the moment, roughly speaking, the Rhine is fed only by sewage treatment plants, glacier ice and a little groundwater inflow.

Between St. Goar and Rüdesheim, navigation depth in the fairway has fallen to between 1.20 and 1.50 meters, preventing most conventional cargo vessels from operating. Fabian Spieß, deputy managing director of the Federal Association of German Inland Navigation (BDB), stated that only isolated freight vessels continue to navigate the Middle Rhine section.

Industrial supply chains disrupted

The reduction in navigable depth has split cargo flows on the river, separating the Middle and Upper Rhine from seaport terminals in Duisburg and Rotterdam. Thomas Puls, a transport and infrastructure expert at the German Economic Institute in Cologne, noted that standard vessels can no longer pass through critical bottlenecks with standard loads.

With the exception of a few specialized ships, which can probably still pass the bottleneck with heavily reduced cargo, the Rhine is de facto divided in two again.

Industrial producers situated along the river, including chemical manufacturers Evonik, BASF, and Lanxess, face supply constraints for heavy and bulk raw materials. A spokesperson for Evonik stated that reduced shipping volumes affect operations at the Marl Chemical Park, Antwerp, and Wesseling, prompting the company to shift select shipments to rail, road, and pipeline networks while drawing from stored inventories. Refineries and steelworks face similar transport hurdles as bulk liquid and solid commodities cannot easily shift to alternative land routes.