Colorado River Compact Over-Allocates 1.5 Million Acre-Feet Annually Against Measured Flow

The Atlantic piece frames the conflict as perpetual regional rivalry, yet the core driver is the 1922 Compact's fixed apportionment that locks in 1920s hydrology assumptions while current gauging at Lees Ferry records a 20 percent decline since 2000. Agricultural users in Arizona and California still draw 70 percent of allocations under federal reclamation contracts that subsidize flood irrigation on low-value crops, creating the incentive to litigate rather than fallow land. Urban growth in Phoenix and Las Vegas absorbs the political blame, but metering and conservation mandates there have already cut per-capita use 30 percent since 1990 while farm districts resist similar efficiency requirements. The next signal will arrive in the 2026 renegotiation deadline, where failure to embed shortage-sharing triggers automatic federal intervention under existing contracts.