ChatGPT tells me

> As a historical U.S. benchmark, an average 18-hole facility had about 80.7 irrigated turf acres and used approximately 152.5 acre-feet/year—about 49.7 million gallons (188 million litres) annually.

So about 220.

But it's still, ahem, a drop in the bucket compared to the California almond industry.

A while back I satirically suggested https://simonwillison.net/2026/Jul/17/spot-birds-not-golf/ that if hyperscalers wanted to relieve the pressure over data center water use they could buy up a few dozen country clubs and turn them into public parks.

(I was only half joking)