Colorado River at the Mexico Border: Not Dry, But Deeply Stressed

The claim that the Colorado River runs dry before reaching Mexico is inaccurate but reflects a dire reality. Water does cross the border—but a fraction of historical flow, and only because of treaty obligations and infrastructure.

Legal Framework: 1944 Treaty

Mexico is guaranteed 1.5 million acre-feet (1.85 km³) annually (1.7 MAF in surplus years). Delivered at Morelos Dam near Algodones. This supports Mexicali Valley agriculture (200,000 ha), Tijuana/Ensenada municipal supply, and the Colorado River Delta remnant wetlands.

Why It Looks Dry

• Overallocation: 1922 Compact divided 16.5 MAF (based on wet-period data); actual 21st-century average ~12.5 MAF
• Drought (2000–present): Worst megadrought in 1,200 years; Lake Mead & Powell at ~35% capacity
• Climate change: Reduced snowpack, earlier melt, +2°F basin temp → 9% flow loss per °C
• Evaporation/Seepage: 1.5+ MAF/yr lost from reservoirs

Delta: Ecological Casualty

Historically 7,800 km² of wetlands. Now <10% remains. Pulse flows (Minute 319, 2014; Minute 323, 2017) briefly restored channels—proving resilience if water returns.

Binational Cooperation

Minutes 319, 323, 330: shared shortage, storage, conservation, delta restoration. Mexico stores water in Lake Mead ("Intentionally Created Surplus"). Joint investment in irrigation efficiency, desalination, reuse.

Bottom Line

The river reaches Mexico—legally, physically, barely. Every drop is accounted for, fought over, and essential. "Dry" is the wrong word. "Overdrawn" is accurate.