Forty million, twenty-five million, or nearly twenty million. Different sources give different numbers for how many people depend on Lake Mead, and each one comes from a real document. In this episode, Walter Briggs, a retired infrastructure inspector, reads the scope section of each report and asks three questions: who wrote the number down, when, and what it actually counts.

We follow the water from Hoover Dam to the Las Vegas intakes, the Colorado River Aqueduct, the Central Arizona Project and the farm fields of the Imperial Valley. Then we walk through the paper trail: the 1922 Compact, Arizona v. California, the 2007 shortage guidelines, and the new 2027-2028 rules signed in August 2026. The real question turns out to be who holds senior water rights when the lake drops, not how many people use it.

Sources:

U.S. Geological Survey, Circular 1381: A Synthesis of Aquatic Science for Management of Lakes Mead and Mohave (2012): https://pubs.usgs.gov/circ/1381/

Bureau of Reclamation, Colorado River Basin Water Supply and Demand Study, summary (2012): https://www.usbr.gov/uc/progact/amp/a...

Bureau of Reclamation, September 2026 24-Month Study (Lake Mead and Lake Powell projections): https://www.usbr.gov/uc/water/crsp/st...

U.S. Department of the Interior, Colorado River Operating Guidelines for 2027 and 2028 (August 2026): https://www.usbr.gov/ColoradoRiverBas...

U.S. Supreme Court, Arizona v. California supplemental decree (tribal present perfected rights): https://www.usbr.gov/lc/region/pao/pd...

Utah State University, The Colorado River Water Supply Crisis in a Few Graphs, Part 2: Agricultural Water Use in the Lower Basin (2026): https://www.usu.edu/ilwa/coloradorive...