Drought strains Colorado River as states brace for water fight

As Lake Powell and Lake Mead sink under prolonged drought and record low runoff, the Colorado River basin is moving toward a legal and political showdown over who will take the deepest reductions. The seven basin states of Arizona, California, Colorado, Nevada, New Mexico, Utah and Wyoming depend on the river for water supply, hydropower production, recreation, fish and wildlife habitat and other benefits, making the coming rules a national test of how scarce water gets divided.

The conflict sits on top of the Law of the River, the dense body of agreements that has governed the basin for a century. At its core is the Colorado River Compact of 1922, negotiated by the seven states and the federal government, a framework often described as one of the most complex interstate compacts in the West. Reclamation began studying Colorado River dams in 1902, and the river itself runs about 1,400 miles from Rocky Mountain National Park in Colorado to the Gulf of California in Mexico.

The immediate flashpoint is the post-2026 operating regime. Several key agreements, including the 2007 Colorado River Interim Guidelines, the 2019 Drought Contingency Plans and related U.S.-Mexico operating agreements, are set to expire at the end of 2026. The Bureau of Reclamation says the Department of the Interior is moving to finalize new operating guidelines by Oct. 1, 2026, because it cannot wait for complete consensus among the states.

That deadline matters because the basin is still operating under severe strain. Reclamation says the 2026 operating plan incorporates the existing interim guidelines, the Upper Basin Drought Response Operations Agreement and the Lower Basin Drought Contingency Plan, a sign that managers are still relying on temporary measures even as the long-term rules are rewritten. The agency has also said the basin’s prolonged drought and record low runoff have driven historically low reservoir levels at Lake Powell and Lake Mead.

Reclamation released a draft environmental impact statement for the post-2026 operating guidelines and strategies for Lake Powell and Lake Mead, and the public comment period ended March 2, 2026. The agency also held virtual public meetings in February 2026, part of an effort to build a new framework before the current agreements lapse.

What emerges next will shape more than a river schedule. The post-2026 rules will determine how shortages are managed, how reservoir releases are triggered and how conservation burdens are shared between the Upper Basin and Lower Basin states, while also affecting treaty operations with Mexico. The coming decision will set a precedent for how the West handles climate-stressed resources when the water simply is not there.