Colorado River Future: Reclamation Releases Draft Plan for Post-2026 Reservoir Operations
The Bureau of Reclamation on January 9th released a draft environmental review outlining potential strategies for managing the Colorado River’s key reservoirs – Lake Powell and Lake Mead – after 2026, a move with significant implications for water delivery, hydropower generation, and infrastructure across the American West.
The Draft Environmental Impact Statement (EIS) assesses various operational alternatives for the two reservoirs beginning in 2027, coinciding with the expiration of the 2007 Interim Guidelines that currently govern coordinated operations at Glen Canyon Dam and Hoover Dam. Notably, Reclamation has refrained from endorsing a specific approach, prioritizing flexibility as ongoing negotiations continue among the seven states that share the Colorado River.
These negotiations involve Arizona, California, Colorado, Nevada, New Mexico, Utah, and Wyoming – collectively known as the Colorado River Compact states. These states are divided between the Upper and Lower Basins under the foundational 1922 agreement that dictates the river’s allocation.
“The Department of the Interior is moving forward with this process to ensure environmental compliance is in place so operations can continue without interruption when the current guidelines expire,” stated a senior official at the U.S. Department of the Interior. “The river and the 40 million people who depend on it cannot wait. In the face of an ongoing severe drought, inaction is not an option.”
A New Reality for a Stressed System
The Draft EIS acknowledges the mounting operational challenges stemming from approximately 25 years of persistent drought conditions throughout the Colorado River Basin. Projections consistently indicate a trend toward even drier conditions in the future. This prolonged aridity has driven reservoir levels to critical lows, impacting hydropower production and complicating dam operations. Federal managers are now increasingly focused on protecting the physical infrastructure alongside ensuring water delivery.
Reclamation analyzed five distinct operational alternatives, each differing in its approach to coordinating releases from Lake Powell and Lake Mead, triggering and distributing water shortages, and managing the storage and release of conserved water under fluctuating hydrological conditions. Experts anticipate that any final agreement among the Compact states will likely incorporate elements from multiple alternatives rather than adopting a single, wholesale solution.
“Given the importance of a consensus-based approach to operations for the stability of the system, Reclamation has not yet identified a preferred alternative,” explained Scott Cameron, acting commissioner of the Bureau of Reclamation, in a released statement. “Reclamation anticipates that, when an agreement is reached, it will incorporate elements or variations of these five alternatives,” Cameron added, emphasizing the EIS’s comprehensive scope for “sustainable and effective management of the Colorado River.”
The Draft EIS directly confronts the proximity of federal facilities to critical operating thresholds. At Lake Powell, the analysis models scenarios approaching the minimum power pool – 3,490 feet – where turbine generation becomes limited, and evaluates operations below this level utilizing alternative outlet works.
Hydropower at Risk
The Colorado River system currently supports nine federally operated hydropower facilities managed by the Bureau of Reclamation, located on the mainstem river and its key tributaries. These include:
Lower Basin and Mainstem:
- Hoover Dam
- Davis Dam
- Parker Dam
Upper Basin and Colorado River Storage Project:
- Glen Canyon Dam
- Flaming Gorge Dam
- Navajo Dam
- Blue Mesa Dam
- Morrow Point Dam
- Crystal Dam
Historically, these facilities have generated around 12 billion kilowatt-hours (kWh) of electricity annually. However, prolonged drought and declining reservoir elevations have significantly reduced output. Reclamation also assessed the potential benefits of establishing buffer elevations to minimize the risk of either Lake Powell or Lake Mead falling into levels that jeopardize hydropower generation and overall system functionality.
To facilitate comparison of the alternatives, the Draft EIS employs a decision-making framework based on “significant uncertainty.” This approach assesses how frequently reservoir levels remain above specified performance thresholds across hundreds of potential future hydrological scenarios, rather than relying on a single predictive forecast. This comprehensive methodology highlights which operating strategies are most resilient to extended drought and identifies scenarios that could push the system into undesirable conditions.
The Colorado River is a vital water source for over 40 million people across seven states, supports hydropower generation at nine federal facilities, serves 30 Tribal Nations, provides water to two Mexican states, and irrigates approximately 5.5 million acres of farmland. Reclamation clarified that the Draft EIS focuses solely on domestic river operations, while a separate, binational process – managed through the International Boundary and Water Commission – is addressing water deliveries to Mexico under the 1944 Water Treaty.
The Draft EIS will be published in the Federal Register on January 16th, initiating a 45-day public comment period that concludes on March 2nd. A final decision regarding post-2026 operations is anticipated before October 1st, the beginning of the 2027 water year.
