Water levels at the Rhine's Kaub pinchpoint fell to minus 6 cm against the WSV benchmark on Oct. 1, a fresh all-time low that halted most inland fuel tanker movements and pushed barge freight rates to roughly ten times their January levels.

The German waterways authority (WSV) pegged the Kaub gauge at 107 cm against its 113 cm reference level, surpassing the previous record of minus 2 cm set just two days earlier on Sept. 29. Only two specialist chemicals barges — Raadsman and Millora — cleared the crossing on Oct. 1, according to Spotbarge, a Dutch shipping and bunker monitoring firm. Shipping otherwise stood still.

What does the shutdown mean for inland fuel supply?

The Rhine carries roughly 2,000–5,000 metric tons per barge and typically requires WSV readings of plus 60–70 cm, or a minimum 173 cm at Kaub, before conventional vessels can transit at normal draft. Spotbarge data show barge rates from the Amsterdam-Rotterdam-Antwerp (ARA) hub to Karlsruhe holding near €200/mt, almost ten times the January baseline.

Loadings from the 190,000 b/d Godorf refinery at Shell's Rheinland complex and the 316,000 b/d Karlsruhe/Miro refinery fell by about a third week over week on Sept. 28, Spotbarge estimates show. Shell did not immediately respond to a request for comment.

"The majority of barges that are now in the Upper Rhine stay there for loadings from the Miro Refinery for local depot supply, such as Strasbourg and Basel, but also with low tonnage," Spotbarge CEO Sebastiaan Kosman said.

Swiss government data show heating oil costs climbed 8% month over month in September, hitting their highest level since 2022.

How severe is the capacity squeeze?

Barges forced to sail the shallower Upper Rhine segments must cut cargo loads by up to 75% when WSV readings drop below 75 cm, a standard industry rule of thumb. With regular tanker traffic halted, pressure has piled onto already-tight Northwest European fuel stocks, a market traders link to the US–Iran conflict.

Arne Lohmann Rasmussen, chief analyst at Danish energy advisory Global Risk Management, calculated that fully replacing Rhine oil-product flows would require roughly 3,000 extra road tankers per day. Switzerland's quality restrictions on gasoline pipelines and capacity caps on regional rail networks have limited rerouting options for traders.

"Low Rhine water levels are the last thing the German economy needs," Rasmussen said. "German industry is already struggling with high energy prices, US tariffs and increasingly tough competition from Asia. A new logistical chokepoint adds higher costs and more uncertainty to an economy already under pressure."

What's the wider picture across European waterways?

The drought crisis extends beyond the Rhine. Readings at Lobith on the Dutch border and at Cologne in western Germany hovered only slightly above recent all-time lows recorded Sept. 28–30. A car carrier ran aground at Düsseldorf harbor earlier in the week. On the Danube, falling levels have exposed long-buried World War II shipwrecks and forced power plant shutdowns across the basin.

The WSV projects a slow recovery at Kaub but expects readings to stay below 10 cm until Oct. 5 — well short of the 173 cm threshold needed to restore normal tanker traffic. Until water levels recover and conventional inland movements resume, heating oil and diesel stocks face renewed strain as peak winter demand approaches.