The Bureau of Reclamation invoked Section 6E of the 2024 Supplemental Environmental Impact Statement Record of Decision on April 30, the procedural step that authorizes a reduction in Lake Powell's annual release volume from 7.48 million acre-feet to 6.0 million acre-feet through September 2026. [1] [2] By Wednesday, that is Day 7. The companion action — releasing 660,000 to 1 million acre-feet from Flaming Gorge Reservoir over the twelve months from April 2026 through April 2027 — is in execution. [3] Together, the actions are projected to add about 2.48 million acre-feet to Lake Powell and raise its elevation by approximately 54 feet, to at least 3,500 feet, by April 2027. [4]

The threshold the agency is defending is 3,490 feet — the elevation at Glen Canyon Dam below which water flows only through the river outlet works rather than through the eight 15-foot-diameter penstocks that drive the powerplant's turbines. [3] The April 24-Month Study projected Lake Powell could fall below 3,490 feet by August 2026 without major intervention. [4] On April 28, Powell's elevation stood at 3,526 feet — about 36 feet of buffer. [3] Inflows for water year 2026 were forecast at 5.02 million acre-feet, 52 percent of average; the most recent April projection cut that to 3.87 million, about 40 percent of average. [3] [5] The April 24-Month Study's end-of-year elevation projection: 3,483 feet. Seven feet below the hydropower threshold.

Tuesday's Day 6 sends Flaming Gorge to 8,600 cubic feet per second read the Day 6 mark as the release ramp framing. Monday's Day 5 confirms the drought template made the framework operational. Wednesday's frame is what comes after the operational fact: the August power-pool cliff at Glen Canyon and the simultaneous 40-percent capacity cut at Hoover Dam downstream.

The Hoover number is the largest second-order consequence and the one most likely to translate into electricity prices. Reclamation's hold-back of 1.48 million acre-feet at Powell — the difference between the 7.48 maf legally minimum release and the 6.0 maf 6E-authorized release — does not disappear; it stays upstream while Lake Mead, fed by Powell's releases, declines further. Hoover hydropower could drop by up to 40 percent as early as fall, the agency told basin states. [3] The cascade is direct: less water at Mead means lower head pressure at the Hoover penstocks, means less generation per acre-foot released, means cuts to the 350,000-plus-customer hydropower distribution that the Western Area Power Administration manages. The arithmetic, in megawatt terms, is not yet public; the qualitative warning is.

The Upper Basin states authorized the action conditionally on April 23. Wyoming Senior Assistant Attorney General Chris Brown briefed stakeholders earlier in April with a release-volume range that bracketed what Reclamation eventually announced. [3] The four Upper Basin governors — Polis of Colorado, Gordon of Wyoming, Lujan Grisham of New Mexico, Cox of Utah — signed an April 9 joint statement asking that any drawdown be "appropriately sized" and that water released from Flaming Gorge be "fully recovered" once the emergency ends. [6] The Upper Colorado River Commission's executive director Chuck Cullom: "It's clear that additional actions at Lake Powell are necessary." [3]

Flaming Gorge sits behind a 502-foot dam on the Wyoming-Utah line. It is 83 percent full, holding about 3.1 million acre-feet. [4] The drawdown authorized through April 2027 will reduce its elevation by approximately 35 feet — roughly a third of its useful storage. [4] The 2022 emergency release of 500,000 acre-feet, in response to the same Lake Powell threat, was followed by a wet winter that recovered the loss; the 2026 release, twice the size, has no equivalent guarantee. The Buckboard Marina at Flaming Gorge is already eyeing a 10-foot drop by late summer; the boat ramps are the most visible economic signal of what 35 feet means for a recreation economy. [7]

The legal architecture under all of this is the 2007 Interim Guidelines, which expire at the end of 2026. The seven basin states have not reached consensus on a replacement framework. Interior has said it will determine post-2026 operations this summer if no agreement is reached. Arizona water director Tom Buschatzke's view: "The fact that this is occurring isn't going to help us, in any way, shape or form, get to a seven-state agreement." [3] The 6E action is, in that frame, a stopgap that buys nine months of physical hydropower at the cost of the political consensus the next framework will need.

What the 6E action does not buy is a long horizon. The same April 24-Month Study that projects 3,483-foot end-of-water-year elevation — seven feet below minimum power pool — also models scenarios in which Powell's storage approaches dead pool elevation 3,370 feet inside the next decade if the basin's hydrology continues at current trends. [4] The "de facto dead pool" elevation discussed by Reclamation modelers — 3,500 feet, the level below which only about 3.7 million acre-feet of Powell's storage is technically accessible through current plumbing — is the elevation 6E is targeting. [5] Holding 3,500 strands water but preserves hydropower. Letting Powell fall below 3,490 sacrifices hydropower and risks structural problems with the river outlet works. There is no good option; the agency picked the less bad one.

The Denver mediation prep, which Upper Basin governors have requested for early May, is the procedural interface between the 6E action and the post-2026 framework. Whether the mediation produces a signed framework this week or kicks the question into Interior's summer determination is the question Day 7 of 6E now sits inside. Reclamation's choice on Friday May 8 — what 24-Month Study runs are released, what scenarios accompany them — will be the next legible data point. The Western Area Power Administration has not yet issued a Hoover-capacity warning to its preference customers; that letter, when it lands, will be the moment the abstract 40-percent number becomes a residential utility-bill number.

The 6E template is now operating. August is the calendar mark the agency is defending against. The fact that the template exists at all — that the 2024 Record of Decision included a Section 6E provision specifically for circumstances Reclamation hoped not to invoke — is the structural acknowledgment that 7.48 maf releases were not sustainable. The basin has been in drought for 25 years. The legal architecture is finally catching up with the physical one. The cost is paid downstream, in electricity, mostly in fall.

-- DARA OSEI, London