Water gauges at Maxau, Kaub, Cologne and Duisburg have fallen to new historic lows in recent days, forcing tri-modal operator Contargo to suspend shipping on the Upper Rhine and the Rhine-Main region entirely and to move volumes onto rail and road — with no relief in sight for Europe's most important inland waterway.

In its latest service update, Contargo warned that vessels on the Middle Rhine now operate only on a limited basis, and only where safe execution of transport can be guaranteed. Should current watermark forecasts materialise, the company said it may need to implement extensive operational measures at short notice.

The commercial implications are immediate. Barge capacity on the corridor — a critical artery for containers moving between Rhine ports such as Duisburg and the seaports of Rotterdam and Antwerp — is shrinking just as shippers head into the autumn booking season. Each vessel withdrawn tightens available slot capacity, and low-water surcharges typically follow as carriers recover the cost of sailing part-loaded boats.

Contargo has already restructured its own network around the outage. The operator confirmed it has shifted transport volumes to rail and road, including two trains per week running between Wörth and Emmerich — a leg of more than 400km. It has also temporarily established a land bridge linking the Middle Rhine region to Emmelsum/Emmerich, effectively replacing barge haulage with truck and rail drayage over the affected stretch.

Full German suspension still possible

Asked whether inland waterway traffic risked suspension across the entire German section of the Rhine, a Contargo spokesperson left the door open. "We cannot say, as this ultimately depends on each individual vessel operator," the spokesperson told RailFreight.com. "Some of Contargo's vessels can operate in very shallow water."

That answer matters for shippers and forwarders planning over the coming weeks. Draft restrictions bite at different thresholds for different operators, meaning capacity on the river will degrade unevenly rather than switch off at a single gauge reading. Cargo owners with draught-sensitive bookings — tank containers, heavy project loads — face the earliest pinch.

DB Cargo wheels up

Rail is absorbing the overflow, and Deutsche Bahn's freight arm is scaling accordingly. DB Cargo announced last month that around 400 additional wagons could be made available at short notice to support industries hit by the low water, though some media reports put the figure as high as 900.

Approached for an update on how that capacity has been deployed and its impact, a Deutsche Bahn spokesperson confirmed demand is concentrated in specific segments. "DB Cargo is responding to increased demand for transport capacity from customers in the Liquids & Bulks business segments (bulk commodities such as mineral oil and coal) as well as in the steel sector," the spokesperson said. "As announced, it is gradually adjusting its wagon fleet capacity. We ask for your understanding that, for competitive reasons, we are unable to provide details on freight volumes or the number of trains."

The picture mirrors previous low-water episodes on the Rhine, when mineral oil, coal and steel flows moved first, because those shippers hold the relationships and volumes to secure emergency rail capacity. Container barge customers further down the queue face stiffer competition for whatever wagon capacity remains.

Infrastructure manager DB InfraGO, which coordinates around 4,500 freight train movements on the German network each day, says the surge is manageable. "Additional rail freight traffic, for example due to the current low water levels, can currently be accommodated within existing operational processes," the DB spokesperson said.

Road capacity the pressure valve

For forwarders, the arithmetic is less comfortable on the highway. Every barge taken off the Middle Rhine releases volumes that must move by truck or rail; with rail uptake strongest in bulk and steel, containerised cargo is likely to lean harder on road haulage — putting upward pressure on truck rates in the Rhine corridor at short notice.

The last comparable crisis, in 2018, showed how quickly the modal shift strains downstream capacity: fuel transport costs spiked, industrial output dipped, and road and rail rates climbed across the corridor. Whether this episode matches that scale depends on how far gauges at Kaub — the river's most notorious bottleneck — keep falling.

Contargo's warning that further "extensive operational measures" could come at short notice signals the operator expects conditions to worsen before they improve. Shippers with Rhine-dependent supply chains should monitor gauge forecasts daily and pre-book rail and road alternatives now, while DB Cargo's incremental wagon capacity is still being rolled out rather than fully allocated.