Early Warning Signals Come From Rhine
Market Monday – Week 18 – Declining river water levels might contribute to worsening capacity situation in Western Europe
While usually we focus on land transportation, today we are turning our attention to the water and trying to understand how declining water levels on Rhine could influence road transportation markets in this heavily industrialized river basin.
As you can see in the included 30-day chart of the Kaub gauge, water levels have seen a steady, concerning decline throughout late April, now hovering around the 120 to 125 cm mark.
The Kaub gauge, located between Koblenz and Mainz in western Germany, is the shallowest point on the Middle Rhine, where hundreds of barges pass every day, transporting more than 50 million tons of cargo each year. This point dictates the maximum draft (and therefore laden cargo weight) for vessels transiting between the deep-sea ports (ARA) and the industrial hinterlands of Germany and France. Long-term average water level at Kaub is 208 cm, and April averages are even higher at 230+ cm.
A water level reading of 120 cm does not mean the river can be crossed by foot (I would strongly advise against it), but it indicates that the operations on the river are already limited by the maximum draft of the barges, as at this level, a standard cargo barge can only move at 60-80% normal capacity by weight. To avoid issues, operators must reduce maximum cargo weight, meaning that now it either takes more vessels to move the same amount of cargo or some of the cargo must be shifted to other modes of transport. River shipping companies usually compensate for this effect by applying low water surcharges, making river transport more expensive and harder to secure.
What makes the current situation so concerning is the calendar. Historically, the Rhine is flush in the spring, filled by Alpine snowmelt and seasonal rains. The traditional “low water season” usually hits in late summer or autumn (August through October). Seeing Kaub levels plunge to 120 cm in late April is rare. We witnessed a similar “spring drought” anomaly just last year in 2025, but before that, you have to look back to the historic European heatwave of 2003, or all the way to the 20th century, to find comparable spring lows. But what is different this year vs 2025 is that the road market went from a relative abundance of capacity to scarcity, as illustrated in our chart below. Last year, the transport industry could absorb some extra freight diverted from the river. However, in our current environment, the outcome might be different.
A single large Rhine barge carries the volume equivalent of 100 to 150 full truckloads of heavy bulk and loose freight like chemicals and steel or intermodal container shipments. If raw materials and import containers begin piling up at BeNeLux terminals, shippers with time-sensitive supply chains will be forced to bypass the river entirely, putting those containers directly on the way south with a truck. Just a few hundred unexpected FTL spot requests may tip the market in its current state, rapidly consuming available trucks. Historical data shows that this quickly drives upward rejection rates for contracted freight and triggers aggressive rate spikes on the spot market.
According to the latest German Federal Institute of Hydrology’s (BfG) 14-day probabilistic forecast, there is no immediate relief in sight. Models show a near-certainty (98%) that levels will drop below 117 cm by early May, worsening the current strain.
And the worst-case scenarios are even more concerning, as the forecast indicates a nearly 50% chance of the Kaub gauge dropping below 100 cm within the next two weeks. At that depth, draft restrictions become severe, and cargo “spills” to the road will be almost unavoidable. The only silver lining is that a complete suspension of barge traffic if the reading drops below the ~77cm level is relatively improbable (<5%).
For road transport professionals operating in these regions, the current Kaub water level is essentially an early warning indicator for truck capacity. While usually early June marks the beginning of the ample capacity and declining spot rates, this year the effect might be reduced or shifted to a later period. We would advise securing critical capacity in the Rhine basin earlier than later and prepare for increased spot market competition if this dry spell continues into May.
Oleksandr Kulish
Senior Consultant