How we got here.

Colorado's bad water year sits inside a much larger, slower story — a two-decade megadrought, a river promised more water than it has, and the reservoirs that are supposed to absorb the difference.

The American Southwest has been in its driest stretch in roughly 1,200 years. Peer-reviewed tree-ring reconstructions identify the period since 2000 as the most severe multi-decade drought — a megadrought — in over a millennium, made worse by human-caused warming.

The useful way to read this is not as a run of dry years that will average back out. It is aridification — a hotter baseline. Higher temperatures pull more water out of soil, snow, and streams before it ever reaches a reservoir, so the same amount of precipitation now yields less usable water than it did a generation ago. The normal we built our infrastructure around is no longer the normal we live in.

On the science: NOAA / NIDIS — drought.gov

The 1922 Colorado River Compact divided the river among seven states, assuming roughly 16 to 17 million acre-feet of annual flow. That figure was more than the river has reliably produced — and far more than it produces now.

The result is structural over-allocation: more water is promised on paper than flows in the channel. The gap is not a bad-luck year; it is built into the founding math. One visible consequence is that the Colorado River often no longer reaches the Gulf of California — the river is spoken for before it gets to the end.

River operations: Bureau of Reclamation

Lake Powell and Lake Mead are the two largest reservoirs in the United States. They are the Colorado River system's savings account: the buffer that lets a fixed set of promises survive a variable supply. Through the megadrought, both have trended toward record-low levels — which is what it looks like when a savings account runs down faster than it refills.

Live storage & elevation: Powell · Mead · drought.gov

Colorado is a headwaters state. The Colorado River and several others begin in its mountains, which means the snowpack measured here is the river's water supply — not a forecast of it, the thing itself, sitting on the peaks waiting to melt.

So a thin Colorado snow year does not stay in Colorado. It propagates downstream — to roughly 40 million people and to the Compact's obligations — long after the local headlines move on. That is why the snowpack chart on the home page is the start of this whole story, not a footnote to it.

SOURCES — Drought science and current conditions: NOAA NIDIS. River operations and reservoir storage: U.S. Bureau of Reclamation. Current as of June 2026; for live reservoir figures, follow the source links above.