KVIG Informative

In 1928, Congress gave Nevada the smallest share of the Colorado River of any state that touches it — 300,000 acre-feet a year, a number nobody expected the state to ever need in full. Nearly a century later, that same fixed number is the hard ceiling on growth for one of the fastest-growing states in the country, just as a new decade-long federal framework locks it in amid the lowest water levels the river’s two biggest reservoirs have seen in more than 60 years.

The Colorado River Compact was signed Nov. 24, 1922, in Santa Fe, New Mexico, dividing the river’s water between an Upper Basin and a Lower Basin, according to the compact’s text held by the U.S. Bureau of Reclamation. Each basin received the right to 7.5 million acre-feet of water a year, with the Lower Basin — California, Arizona and Nevada — granted an additional 1 million acre-feet on top of that.

The Boulder Canyon Project Act of 1928 divided the Lower Basin’s water among the three states. Section 4(a) of the act apportioned 300,000 acre-feet a year to Nevada and 2.8 million acre-feet to Arizona, according to the act’s text held by the Bureau of Reclamation. California separately agreed, under a companion measure, to cap its own annual use at 4.4 million acre-feet. Nevada’s share was the smallest granted to any of the three Lower Basin states.

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Nevada’s effort to manage that allocation began years before the number was even finalized. Nevada Gov. Emmet D. Boyle formed an informal commission to represent the state’s Colorado River interests starting in 1920, according to Nevada State Archives records. The body was formalized the following year as the Colorado River Development Commission. The Nevada Legislature created its permanent successor, the Colorado River Commission of Nevada, in 1935, according to a finding aid for the commission’s records held by UNLV Special Collections and Archives.

The commission negotiated on Nevada’s behalf in disputes over the river for decades, including the U.S. Supreme Court case Arizona v. California, which ran from 1931 to 2000, according to the UNLV finding aid. It also helped bring the Colorado River Storage Project online in 1956 and the Southern Nevada Water Project — the treatment infrastructure that turned Nevada’s paper allocation into delivered water — online in 1960, the finding aid states.

Nevada’s 300,000-acre-foot allocation stayed fixed even as Las Vegas grew into a metropolitan area serving more than 2 million residents. In 1991, seven local water and wastewater agencies — Big Bend Water District, Boulder City, Clark County Water Reclamation, Henderson, Las Vegas, the Las Vegas Valley Water District and North Las Vegas — formed the Southern Nevada Water Authority to manage that fixed allocation on a regional basis rather than agency by agency, according to SNWA’s own account of its founding.

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That allocation is now shrinking further. The Bureau of Reclamation placed Nevada in a Level 1 Shortage Condition for 2026 operations, cutting the state’s delivery by 21,000 acre-feet — 7% of its full entitlement — according to the bureau’s August 2025 24-month study. The study projected Lake Mead’s elevation at 1,055.88 feet as of Jan. 1, 2026, 20 feet below the level that triggers a shortage declaration.

On July 31, 2026, the Bureau of Reclamation adopted a 10-year framework governing how Lake Powell and Lake Mead are operated through 2036, permitting Lower Basin shortages of up to 3 million acre-feet a year, according to the U.S. Department of the Interior. The department said the combined contents of the two reservoirs had not been this low since before Glen Canyon Dam began filling in 1963. The 300,000-acre-foot line Congress drew for Nevada in 1928, when the state’s future water needs looked negligible, is now the ceiling on how much of the fastest-growing region in the country can keep growing. The framework signed this summer decides how that ceiling gets enforced through 2036 — whether it holds, or shrinks again before then, is no longer a question Nevada gets to answer alone.