Rhine water levels at Kaub, Germany which is the river's shallowest chokepoint, fell this month to their lowest level since the 2018 drought, when the gauge first hit its previous record of 25cm. Multiple readings in early August 2026 put the navigable depth as low as 10-15cm, well below that benchmark. Forecasters have warned it could take weeks of sustained rainfall to restore normal conditions, with disruption potentially extending into October.
The immediate operational picture is straightforward: large barges cannot operate at all, smaller vessels are running at a fraction of their usual payload, and shippers are competing for rail and road capacity that was not built to absorb the difference. Barge freight rates on the Rotterdam-Karlsruhe route have reportedly climbed from around €45 a tonne in June to as much as €155-160 a tonne in August — more than triple, and a sharper spike than the equivalent move during the 2022 drought.
The Rhine carries around 70% of Europe's inland waterway freight, moving diesel, heating oil, coal, grains and cocoa for companies including Thyssenkrupp, BASF and Lanxess. German chemical group Covestro has warned it may be unable to meet certain delivery obligations, given that more than 30% of its finished goods depend on inland shipping.
Estimates of the GDP hit vary by bank. ING has put the drag on German GDP growth at around 0.3 percentage points, warning 2026 could match or exceed the 2018 drought's impact; Deutsche Bank's 2018 estimate was closer to 0.2 points; the Kiel Institute has previously put the 2018 hit at 0.4 points of GDP alongside a 1.5% fall in industrial production. A widely circulated estimate of 0.35 points attributed to Commerzbank could not be independently verified and should be confirmed with the bank directly before republishing.
This is not an isolated Rhine event. Satellite imagery from early August showed comparably severe drops on the Po in Italy, the Loire in France and the Danube in Hungary — the same drought affecting all four of Europe's major rivers simultaneously.
TT Club, which underwrites marine cargo and logistics risks including inland waterway operations, has published a warning framed not as a response to this specific event but as a structural market position: drought conditions on major inland waterways have become frequent enough that they should be priced and planned for as a business continuity risk rather than treated as exceptional.
This is a consistent position for the insurer, TT Club issued a near-identical warning in January 2025 following the prior year's disruption, with Neil Dalus of its loss prevention department making the same point then: that climate effects on river navigation demand infrastructure investment, risk mitigation planning and workforce training, not a one-off response. Three significant disruptions in 2018, 2022 and now 2026 support that framing.
The more complex insurance question is not the water level itself but who controls access to the water when levels fall.
The Danube illustrated the point starkly this year. Romania shut down both reactors at its Cernavodă nuclear plant after the Danube's flow fell to a record low a full shutdown, though not unprecedented; the plant was also fully shut for several weeks during the 2003 drought. Neighbouring Hungary's Paks plant, which normally supplies around a third of the country's electricity, cut output sharply and warned a complete shutdown was a realistic possibility as it moved through the stages of its low-water contingency plan, before a partial rebound in river levels eased the immediate pressure. Both governments made the calls for energy security reasons; the effect on barge traffic was direct and outside the control of any transport operator or cargo owner.
As drought conditions become more frequent, governments are likely to face similar choices more often, balancing drinking water supply, agricultural irrigation, energy generation and freight transport against each other. A cargo owner whose shipment is delayed because a government prioritised power generation over navigation has no contractual claim against the river authority. Whether their marine cargo policy responds depends on how the policy defines covered causes of delay and whether drought-related navigation restriction falls within those terms.
The coverage gap TT Club describes is not entirely unaddressed. Following the 2018 drought, Swiss Re Corporate Solutions launched FLOW, a parametric product that pays out based on measured water levels at defined river gauges rather than a loss adjustment process, specifically to cover the business interruption and cost impact of high or low water levels.
AXA Climate has written parametric triggers exposed to Rhine water levels, and MGA Descartes Underwriting offers an index-based river-level product aimed at commodity traders, chemical plants and other river-dependent industrial clients. Aon's 2026 Climate and Catastrophe Insight report estimated global economic losses attributable to drought at around $13 billion in 2025 alone, underlining why this category is drawing sustained reinsurance and broker attention rather than being treated as a one-off peril.
The existence of these products cuts against any reading of TT Club's warning as identifying a total market gap. The more precise question for brokers is whether a given client's existing cover, typically a standard marine cargo policy rather than a bespoke parametric one, actually responds, or whether that protection has to be bought separately.
Standard marine cargo cover, written under the Institute Cargo Clauses (A, B or C), generally excludes loss, damage or expense proximately caused by delay including under Institute Cargo Clause A, the broadest "all risks" wording. That exclusion applies regardless of what caused the delay. A drought-driven navigation restriction that adds weeks to a shipment's transit time, without damaging the cargo itself, is a delay loss by definition, meaning it typically falls outside standard cargo cover whether or not the policy is written on an all-risks basis. Business interruption or freight liability cover, not cargo cover, is the more likely place any drought-related financial loss would need to be addressed, and only if that cover's insuring clause is broad enough to capture a non-damage event with no direct physical loss to the insured's own property.
The timing of TT Club's warning is specifically awkward because inland waterways have become a growing part of corporate decarbonisation strategies. Shifting freight from road to river is a credible emissions reduction measure, and it has been adopted as such by major shippers across Europe and North America. The environmental case for waterborne freight is real, offering lower emissions per tonne-kilometre than road, less congestion, less infrastructure wear.
But a decarbonisation strategy that routes cargo through a channel subject to recurring multi-week closure is not a resilient one. TT Club's position is that sustainable transport choices need to also be operationally robust ones, and that planning based on historical water level averages is no longer adequate given how the frequency of extreme drought years has shifted.
Some companies have already started responding to the new normal. BASF, whose Ludwigshafen headquarters sits on the Rhine and which lost an estimated €250 million from the 2018 drought's production and delivery shortfalls, has since commissioned a new low-draft freight vessel, the Stolt Ludwigshafen, designed to keep operating at water levels that would ground conventional barges. BASF's chief executive has said the company is materially better prepared than it was in 2018 as a result.
But that kind of investment remains limited across the sector: Cologne-based operator HGK runs around 350 barges and, as of this year, only four are low-water vessels, with three more under construction, illustrating that fleet-wide adaptation is real but slow, and that the redundancy TT Club is calling for does not yet exist at scale. Separately, plans to accelerate dredging of the Rhine's shallowest stretches have stalled in German coalition politics, with the industry association BDB indicating the key middle-Rhine dredging project is unlikely to happen before 2030 at the earliest.
That is not an argument against inland waterway freight, it is an argument for building redundancy into supply chains that rely on it, before a disruption forces the issue, and for recognising that the physical fixes (shallow-draft vessels, dredged channels) are years away from being available at the scale the risk now requires.
Neil Dalus, risk assessment manager at TT Club, said drought should no longer be considered a rare environmental issue but a business continuity risk capable of affecting vessel capacity, route availability, port operations and the wider transport network.
For brokers placing marine cargo or freight liability cover for clients with inland waterway exposure, the practical questions are specific:
Those questions have different answers depending on policy wording, and the answers are worth checking before a disruption makes them urgent.
