Rhine’s 5-centimetre bottleneck throttles BASF

BASF has started throttling plants at Ludwigshafen, Europe's largest integrated chemical complex, because the Rhine is too shallow to deliver enough raw materials by barge. On 17 August, the gauge at Kaub — a narrow stretch of the Middle Rhine between North Sea ports and southern German industry — read 5 centimetres, a new record low (Netz-Trends, ELWIS). A gauge reading is not the river's actual depth — the riverbed sits below the gauge's zero mark, so ships still float — but it determines how much cargo a barge can safely carry. At 5 cm, the answer is: not nearly enough.

How shallow water breaks a chemical plant

Ludwigshafen works as a "Verbund," an integrated system where one unit's waste or byproduct feeds the next. Efficient when everything flows. Fragile when an input runs short, because cutbacks in one unit cascade through the whole site.

The inputs running short arrive by barge: methanol, butane, propane, ammonia (BC Insight). A barge that normally carries around 1,200 tonnes now loads roughly 350. Fewer raw materials reach the plant per trip, and at some point trucks and trains cannot make up the difference.

FAZ reported that BASF had already throttled its first Ludwigshafen plants, though it did not name which ones. CEO Markus Kamieth confirmed on 17 August that the company cannot fully meet delivery obligations for some products (Reuters).

The sharpest evidence comes from BASF's force majeure notices — legal declarations telling customers that an extraordinary event prevents full contractual delivery. In mid-July, BASF declared force majeure on two plasticisers (chemicals that make plastics flexible) at Ludwigshafen (ICIS). Separately, it issued notices on surfactants (chemicals used in detergents and industrial cleaning) from other European sites, all citing Rhine logistics constraints (C&EN).

Who pays along the corridor

BASF is the biggest name but not the only one hit. Covestro, which makes precursors for foams in mattresses and refrigerators, declared force majeure at its Dormagen site on the Lower Rhine, saying raw-material flows were "significantly restricted" and that road and rail could not fully compensate (MarketScreener, Reuters).

Barges still running through Kaub carry about 30-35% of their normal load, according to Dutch inland-shipping sources (Schuttevaer). That means more trips for the same cargo and higher freight costs per tonne — a cost that lands on whoever buys what barges carry. In Belgium, construction firms reported surcharges of €17 per tonne on gravel, with barges needing four trips for what one used to deliver (Gazet van Antwerpen).

Real damage, bounded damage

The IfW Kiel institute estimated that Rhine low water could cost €1-2 billion in lost value added (output generated by firms along the corridor, not retail sales) in the third quarter, shaving 0.1-0.2 percentage points off German GDP (Zeit). German quarterly growth has been running near 0.2%, so even the low end of that range would wipe out most of a quarter's expansion.

Kamieth said the situation was less severe than the 2018 Rhine drought (Reuters). But the Kaub gauge never dropped as low as 5 cm during that episode (Netz-Trends). The difference may be that 2018's drought lasted longer and spread wider; this one is deeper at the bottleneck but, so far, shorter.

The evidence is specific. Rhine drought has crossed from a shipping problem into a production constraint for chemical firms on the river, above all between Kaub and Ludwigshafen. Trucks, trains and low-water barges redistribute the scarcity. They do not create the capacity that full barges provide.