LAKE MEAD, Nev.—When you head out on Nevada’s Lake Mead, the first thing you notice is a white line. That’s where the water used to be.

What did this look like a decade ago?

“This was all underwater,” said Pat Mulroy, the general manager of the Southern Nevada Water Authority. “I mean boats were everywhere. There was a whole marina here.”

Mulroy said that the drought began 14 years ago. Satellite photos show the Colorado River, which feeds Lake Mead, is drying up — so the lake is rapidly shrinking. Islands are growing, and boats are floating far from where they once were.

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