No upper-basin or lower-basin filing surfaced Thursday challenging the Bureau of Reclamation's first-ever invocation of Section 6E of the 2024 Interim Guidelines, two days after Reclamation cut Lake Powell's water-year release from 7.48 to 6.0 million acre-feet. [1] The silence is the artifact. Wednesday's paper argued that the invocation language read 6E as a forward-looking management tool rather than a triggered emergency tool, and that whichever state filed first would set the procedural pace. Forty-eight hours later, no state has filed.

The Arizona attorney general's office and California's Department of Water Resources have been preparing complaints since Reclamation's April 17 announcement, according to coverage in the Colorado Sun and AZ Central. [2] Neither office issued a Thursday statement on filing intent. The Imperial Irrigation District and Central Arizona Project — the largest junior-rights holders facing delivery cuts — declined to add to their April 17 statements. [2] The Navajo Nation president's Tuesday statement calling the invocation "a unilateral federal action with consequences for tribal sovereignty" remained the most recent formal tribal objection on the procedural record.

What the silence converts is the precedent. Section 6E was paragraph language in a 2024 Record of Decision until Reclamation invoked it; it is now a documented federal-action precedent that has gone two days without a court challenger. Each unchallenged day extends the operational window in which Reclamation can argue the procedural reading stands. The 2027 water-year trigger language — the forward-looking interpretation Lower Basin counsel called overreach — is, in effect, the working interpretation while the silence holds.

The seven states' counsel meet Friday. The 24-Month Study scheduled for August will recompute the trigger projection. Litigation, when it comes, will be a complaint about a precedent that has had time to set.

-- DARA OSEI, London