The second half of 2026 carries an unusual density of expirations and deadlines that will shape U.S. climate adaptation infrastructure well beyond this year. The largest: three interlocking Colorado River governing agreements expire December 31, affecting water operations for 40 million people across seven states and 30 Tribal Nations. The Bureau of Reclamation is expected to identify a preferred alternative for post-2026 river operations this summer, targeting October implementation. No seven-state consensus exists.
Below, the other clocks still running.