Commercial navigation on the Rhine is on the verge of being effectively cut in two as record low water on the Danube and restrictions on Dutch canals underline the growing threat drought poses to Europe's inland freight network, according to Splash247. Europe's inland shipping system is being pushed towards breaking point as one of the continent's most severe droughts in decades drains the Rhine, Danube and connecting waterways to levels rarely — and in some cases never — recorded before.
Kaub bottleneck splits the Rhine
Germany's inland shipping association BDB has warned that commercial navigation through the critical Kaub bottleneck could become impossible this week, Splash247 reported. The Kaub gauge, south of Koblenz, has fallen to around 16 cm, giving a calculated navigable channel depth of only about 1.29 m. Forecasts suggest the gauge could fall into single digits for the first time.
At such low water levels commercial vessels will no longer be able to move cargo through the area, effectively splitting the Rhine into two separate navigation systems. To the north, ships would still be able to move between Amsterdam, Rotterdam and Antwerp, the lower German Rhine and western Germany's canal network. To the south, traffic could continue on the Main, Moselle and Neckar and through the Main-Danube Canal — but without the vital Rhine connection between the two systems, according to Splash247.
Payloads shrink and freight rates climb
The commercial impact is already substantial. Some barges are carrying just 20% of normal payloads, forcing operators to deploy far more vessels to shift the same amount of cargo, Splash247 reported. Tanker barge freight from Rotterdam to Karlsruhe climbed to around €150-155 per tonne at the end of July, versus approximately €45 at the end of June.
| Metric | Value |
|---|---|
| Kaub gauge level | ~16 cm |
| Navigable channel depth at Kaub | ~1.29 m |
| Tanker barge freight Rotterdam–Karlsruhe, end June | ~€45 per tonne |
| Tanker barge freight Rotterdam–Karlsruhe, end July | ~€150–155 per tonne |
| Danube water level at Budapest, early August 2026 | ~10 cm |
| Previous Budapest low-water record (2018) | 33 cm |
Germany's industrial heartland depends heavily on the Rhine for movements of chemicals, oil products, coal, ores and other bulk commodities. Industrial groups have already reduced production as raw material supplies tighten, while German economists warn there simply is not enough spare road and rail capacity to replace river transport, according to Splash247.
One inland vessel can substitute for roughly 60 trucks.
North Rhine-Westphalia, Lower Saxony, Rhineland-Palatinate and Saarland have responded by relaxing Sunday truck restrictions in an attempt to relieve the bottleneck.
Danube record lows and grain export pressure
The problem extends well beyond Germany. On the Danube, water at Budapest dropped to around 10 cm earlier this month, comfortably below the previous low-water record of 33 cm reached in 2018, Splash247 reported. Cargo vessels in Bulgaria are being forced either to wait or sail with reduced loads, while extensive dredging is underway in Romania to keep a narrower navigation channel open.
The timing is particularly painful for grain trades. The Danube is an essential route into Romania's Constanta, a major outlet for Romanian agricultural exports and an alternative gateway for Ukrainian grain. Low water is forcing barges to sail light, stretching rotations and pushing more cargo onto already pressured road and rail networks. Combined rail and Danube capacity can move only around one-third of the volumes handled by Ukraine's Black Sea ports, according to Splash247.
The river crisis has become so extreme in Romania that authorities have been sinking rock-filled barges near the Cernavoda nuclear plant to redirect water towards its cooling system after one reactor was shut.
Dutch canals halt and truck demand jumps
Canals are not immune either. In the Netherlands, navigation through the Eefde locks on the Twentekanaal was halted in late July because water could no longer be maintained at levels required to protect quay walls and embankments, Splash247 reported. Dutch logistics association TLN estimates the closure creates demand for around 1,500 additional truck movements a day.
The Rhine drought of 2018 was regarded as an exceptional event, disrupting German industry and forcing companies to redesign supply chains. In 2026, the more worrying feature is how early the records are falling, according to Splash247.
Watch list
- Forecasts suggest the Kaub gauge could fall into single digits for the first time, which would make commercial passage impossible and permanently split the Rhine's two navigation systems for the duration of the low-water event.
- Further rate escalation on the Rotterdam–Karlsruhe tanker barge lane and other key German inland routes is possible if payloads stay near 20% of normal.
- Danube navigation through Romania and Bulgaria remains dependent on continued dredging and the strength of the grain export season.
- Dutch canal closures, including the Eefde locks on the Twentekanaal, could tighten if water levels cannot be maintained to protect infrastructure.
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