Click on the Image for PDF Document.

The delta region begins just beyond the Colorado River's departure from the United States' southern boundary, and includes portions of the Mexican states of Sonora and Baja California stretching south to the upper Gulf of California. The delta once received all of the ~15 million acre-feet of annual water flow from the United States. Now only ten percent of that flows across the border, all of which is consumed by municipal, industrial, or agricultural users in Mexico. The only water that now
regularly reaches the delta region comes from agricultural wastewater.

This PDF document is generously provided by David L. Alles. You can read more of his work on the Colorado River on his website.