Green flood alert in United States

Supply-chain Risk Briefing: US Multiple Flood Alert

1. Summary

Moderate flooding occurred across multiple US regions including Michigan, Wisconsin, and Hawaii from April 13-15, forcing 150 people to evacuate. Notably, additional evacuation orders were issued due to damage risks at Michigan's Cheboygan Dam and Big Falls Dam, while Hawaii faced its worst flooding situation in 20 years.

2. Supply-chain impact

• Midwest agricultural supply chain disruption: Michigan-Wisconsin region is a major grain production area, with concerns over planting delays and agricultural infrastructure damage due to spring flooding
• Inland logistics network shutdown: Potential inland waterway disruptions from flooding in Michigan's Great Lakes connecting waterways and Wisconsin's Mississippi River tributaries
• Hawaii tourism and logistics hub dysfunction: Flooding at Hawaii's airports and ports, serving as Pacific transit hubs, expected to delay Asia-US mainland logistics
• Dam failure cascade effects: Risk of power supply disruption and downstream industrial facility shutdowns due to damage to Big Falls Dam and other water facilities
• Regional manufacturing temporary suspension: Production disruptions and parts transportation delays in Michigan, a region dense with automotive parts supply chains

3. Watch points

• Dam safety assessment results: Recovery schedules for critical infrastructure including Cheboygan Dam and Big Falls Dam, and additional damage risk levels
• Agricultural damage scale assessment: Degree of grain price fluctuation and supply-demand disruption due to Midwest spring planting season impacts
• Hawaii airport and port reopening timeline: Normalization of Pacific logistics hub functions and recovery of Asian supply chain connectivity