Drought conditions are threatening to disrupt supply chains across major global water routes, from the Panama Canal to the Rhine River in Europe, as authorities implement restrictions that could reduce cargo capacity on critical trade lanes.

The Panama Canal Authority (PCA) announced this week that it will lower the maximum authorized draft for cargo vessels transiting its neopanamax locks from 49.5 feet to 47.5 feet through a phased series of reductions extending into early September. The decision follows a dry rainy season that has depleted water levels in Gatun Lake, the freshwater reservoir that feeds the canal's lock system connecting the Pacific and Atlantic oceans. The canal handles roughly 5% of global maritime trade, making even modest capacity reductions consequential for interconnected shipping networks.

Effective August 26, 2026, the maximum draft for vessels using the neopanamax locks will be reduced to 48 feet. A further reduction to 47.5 feet will take effect by September 3. A neo-panamax vessel, which typically carries 13,000–14,000 twenty-foot equivalent units (TEUs), generally requires a water depth of at least 50 feet to operate at full capacity. The timeline coincides with the traditional peak shipping season for trans-Pacific holiday cargo, amplifying the potential impact on inventory planning for retailers and manufacturers.

The PCA stated that the measure reflects current water levels and projected conditions in Gatun Lake over the coming weeks, and forms part of its ongoing water management and operational strategy to ensure the long-term sustainability of canal operations. The authority confirmed it will not reduce the number of daily vessel transits.

These represent the fourth and fifth draft adjustments this year and come as forecasters prepare for the potential effects of El Niño, the climate phenomenon that produced similar dry conditions in the region during 2023. During the 2023–24 El Niño event, vessel traffic through the canal was sharply curtailed, resulting in a capacity-driven bottleneck.

Ocean carriers have already begun passing costs associated with the canal restrictions on to shippers. Mediterranean Shipping Co. (MSC) has assessed a charge of $100 per TEU on Asia–U.S. East and Gulf Coast cargo. CMA CGM charges on the same trade have been reported at up to $320 per TEU.

The reduced draft limits will force carriers to lighten loads, decreasing the volume of cargo per vessel bound for U.S. East Coast ports. In response, some discretionary Asia cargo destined for inland markets may shift to West Coast–intermodal routings, moving through the ports of Los Angeles–Long Beach, Oakland, and Seattle–Tacoma in the United States, or Prince Rupert and Vancouver in Canada, before continuing by rail. That alternative trades a longer and potentially more expensive domestic rail leg for greater reliability in vessel payload availability compared with the all-water Panama route. Diversion via the Suez Canal has been constrained since late 2023 by ongoing attacks on commercial shipping in the Red Sea, which have prompted many carriers to reroute around the Cape of Good Hope, limiting viable alternatives to the Panama transit for Asia–East Coast trade.

In Europe, drought is simultaneously affecting navigation on the Rhine River, which connects the major ports of Rotterdam and Antwerp-Bruges with industrial centers across the Netherlands, Germany, Switzerland, and Central Europe. DHL reported that current low water levels are creating significant challenges for inland transportation, with reduced barge capacity leading to longer transit times, rising transport costs, and growing pressure on alternative rail and road networks.

Source: FreightWaves