Why the Colorado River't Reach the Ocean

TL;DR

The Colorado River never reaches the ocean because humans divert 100% of its water for cities, farms, and industry before it gets there.

Key Points

• 1.The Colorado River is completely consumed by diversions before reaching the sea. Starting at 10,100 ft in Colorado, its 1,370-mile flow is siphoned by cities, farms, and industry — leaving literally zero water to reach the Gulf of California.
• 2.Major urban diversions account for enormous shares of the river's flow. A pipe at Lake Havasu takes 8% to LA and San Diego; another takes 11% to Phoenix and Tucson via a 100-ft-wide canal that is existential infrastructure for one of America's fastest-growing regions.
• 3.A 1922 water-sharing agreement promised more water than the river actually produces. The US states and Mexico divided 16 million acre-feet annually, but the river now flows only ~13 million acre-feet, and renegotiations are ongoing and failing.
• 4.The Imperial Valley and Mexicali Valley consume the final shares. A dam on the US-Mexico border diverts 20% to California's Imperial Valley for winter produce; Mexico receives the last ~10% and immediately canals it all to the Mexicali Valley — leaving nothing downstream.
• 5.The Colorado River Delta ecosystem collapsed but showed it could recover. A 2014 experiment releasing water downstream saw bugs return in days, birds in weeks, and plants in months — but funding ran out, water stopped, and the recovery ended, partly because 200 Phoenix-area golf courses need the water.