Maersk (MAERSKB DC) has warned that low Rhine water levels could worsen to the point barge transport is no longer possible

• "The applicable surcharges during low water situation in the river Rhine (measure point Kaub), which is a low water situation at measure point Kaub - middle part of the river Rhine starts from 1.50 meters and lower."
• "Kindly note that in case of water levels at Kaub falling below 81cm or Duisburg-Ruhrort below 181 cm, we regret that a loading guarantee for your cargo cannot be granted anymore."

Low water on the Rhine is a recurring seasonal disruption with an established transmission pattern: barges are the workhorse for moving coal, oil products, chemicals, grains and containerised cargo to and from the inland industrial belt, and falling draft forces vessels to load progressively lighter before stopping altogether, which is exactly what the surcharge thresholds and the withdrawal of loading guarantees in this notice describe. In past episodes of this kind the sequence has been surcharges first, then reduced load factors, then capacity withdrawal, with the burden falling on freight rates for barge space and on cargo owners forced onto rail and truck alternatives, which tighten and reprice in turn. The industrial read-through has historically concentrated on refiners, chemical producers and coal-fired generators dependent on river feedstock, where past low-water stretches have forced run-rate cuts when inventories ran down. The Kaub gauge is the chokepoint the market watches, and the relevant tells are the trajectory of the level against the surcharge trigger and the threshold below which loading guarantees lapse, plus whether rainfall forecasts offer replenishment, since hot dry spells are the usual precondition. Watch for cascade effects into German diesel and heating oil differentials, where prior episodes of this kind have shown the clearest pricing response.