Port congestion has become one of the most significant operational challenges facing global maritime supply chains. According to a guide from Kpler, understanding how to identify, measure, and respond to port congestion is critical for maintaining supply chain efficiency and controlling costs.

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Identifying and Measuring Congestion

Port congestion occurs when the volume of vessels seeking to call at a port exceeds the terminal’s capacity to efficiently process them. The most visible sign is vessels waiting at anchor for berth allocation. When berth waiting times extend to multiple days from a typical 6-12 hours, it indicates significant congestion.

Other critical indicators include extended container vessel turnaround times and container yards operating above 75-80% utilization. Declining carrier schedule reliability for vessels calling at specific ports also often indicates emerging congestion. Quantifying port congestion requires multiple metrics. These include the count of vessels at anchor, average berth waiting time, and container dwell time. Terminal productivity metrics include container moves per crane per hour and gate turn times. Port call duration variance compares actual vessel turnaround times against scheduled or historical averages. Predictive congestion modeling at the terminal level uses historical patterns, current vessel positions, and forecasted arrivals to predict congestion 6+ weeks in advance.

Causes and Global Hotspots

Port congestion stems from supply-demand imbalances and operational inefficiencies. Demand surge events, such as post-pandemic demand surges or pre-holiday shipping rushes, can overwhelm terminal capacity. The use of ultra-large container vessels, which discharge and load 3,000-5,000 containers per call, compounds the effect. Labor shortages and disputes, equipment constraints, and inadequate landside infrastructure also contribute. Weather disruptions and network effects, where congestion at one major port causes cascade delays across entire trade lanes, are additional factors.

Port congestion is dynamic, but several ports consistently experience significant congestion. These include Shanghai and Ningbo-Zhoushan in China, Singapore, Los Angeles and Long Beach in the United States, and Antwerp and Rotterdam in Europe. MarineTraffic data reveals that congestion may or may not impact an operator, depending on whether their vessel is calling at a non-congested terminal within a port.

Financial Impacts: Charges and Freight Rates

Port congestion charges are additional fees imposed when congestion increases operational costs. During the 2021-2022 period, major carriers implemented temporary port congestion surcharges in response to unprecedented congestion at the ports of Los Angeles and Long Beach. Terminal congestion fees can take the form of peak period charges, reservation fees, or dwell-time penalties. Drayage companies may also add surcharges when severe congestion reduces daily truck productivity.

Congestion charges are calculated using various methods. The cost-recovery method allocates actual incremental costs across containers. Market-based pricing sets surcharges based on market conditions. Tiered structures may scale charges with the severity of delays, and some carriers implement regional surcharges.

Port congestion creates upward pressure on shipping freight rates. It reduces effective vessel supply, increases schedule recovery costs like bunker fuel, and creates equipment imbalances that require costly repositioning. During sustained congestion, carriers may build risk premiums into rates, and market psychology shifts, giving carriers more pricing power. Some carriers now use port pair pricing differentiation, charging premium rates for congested ports while offering discounts for less congested alternatives.

Management Strategies

Proactive strategies can minimize the impact of port congestion. These include deploying visibility platforms to track congestion indicators, evaluating alternative gateway ports, and tracking carrier performance. Increasing safety stock levels or advance order timing for markets served through chronically congested ports can prevent stockouts. Negotiating freight contracts that limit congestion surcharge exposure or include schedule reliability guarantees is recommended. Sharing forecasted demand information with carriers and forwarders earlier enables better vessel space planning.

Organizations that understand how to identify, measure, and respond to terminal congestion can maintain competitive advantages through superior supply chain resilience and cost management.

Source: IndexBox Market Intelligence Platform