Alfalfa for cattle drinks 26% of Colorado River, study finds

A single crop, alfalfa grown to feed beef and dairy cattle, drinks more Colorado River water than every city and industry in the basin combined. That is the headline finding from a new accounting led by Brian Richter and 11 co-authors, written up by the Colorado Sun.

The numbers the paper puts on the table are stark. Alfalfa hay uses more than 5 million acre-feet of Colorado River water a year, about 26% of everything consumed in the basin. Every city, commercial user and industry across the seven Western states combined uses roughly 3.5 million acre-feet, or 18%. Natural and human consumption together averaged 19.3 million acre-feet a year between 2000 and 2019, with human uses alone around 13.6 million. To stabilize Lake Mead and Lake Powell, Richter's team says basin consumption has to drop by 22% to 29%, which they translate to cuts of 2.4 million to 3.4 million acre-feet a year.

That reframes the argument, because most of the public conversation about river cuts still points at faucets, lawns and swimming pools. The paper makes it hard to keep doing that with a straight face. Even zeroing out every urban and industrial user in the basin would not close the gap. The gap is in the alfalfa fields, and the alfalfa fields exist because there is a beef and dairy industry buying the hay. That is why reporter Shannon Mullane opens on cheese and hamburgers instead of showerheads.

The honest caveat is that neither the study nor the story gives you a per-burger arithmetic. The 'quarter of the Colorado River' framing in the headline is rhetorical shorthand for the 26% alfalfa figure, not a life-cycle calculation for any specific supply chain. The reporting also does not tell you which alfalfa acres are the cheapest to fallow, how much of the crop is exported rather than fed to U.S. cattle, or how the 22% to 29% cut would allocate across the seven states, 30 tribal nations and Mexico that share the river.

What is worth watching is where the money and the pressure land next. If Western states are serious about that top-line reduction, the near-term levers are alfalfa buybacks, deficit irrigation and rotational fallowing, plus procurement pressure from the largest beef and dairy buyers. Any plan that still leans mostly on residential conservation is not doing the arithmetic the paper just laid out.