The road to the ballot
The strange thing about the Desert Discovery Center fight is that both sides loved the Preserve. The city’s planners saw the Gateway Trailhead as the natural site for a world-class interpretive campus — a place to teach the Sonoran Desert to the visitors already hiking it. But the residents who had spent a quarter century taxing themselves to buy the McDowells heard a different proposal: buildings, parking, and ticketed attractions inside land they had paid to keep exactly as it was. The Preserve had been assembled by direct democracy — the votes of 1994, 1995, and 2004 — and a project its owners never voted for felt, to many of them, like a breach of contract.
So they went back to the only authority the Preserve had ever answered to. Protect Our Preserve organized, gathered signatures, and qualified Proposition 420 for the November 2018 ballot: a charter amendment, not an ordinance, so no future council could quietly undo it.
What 71 percent settled
Election night was not close. Roughly seven voters in ten said yes, and the charter now reads the way the campaign promised: no development or repurposing of Preserve land without the public’s consent. The Discovery Center was finished, and so was the broader idea that city hall could decide the mountains’ future on its own. The McDowells had gone from land the city owned to land the city merely holds in trust for its electorate.
The vote also read as the closing statement of a thirty-year argument. Four elections — 1994, 1995, 2004, 2018 — form the most consistent referendum record in Arizona: whatever Scottsdale disagrees about, and it disagrees about plenty, the Preserve is settled law because the people keep making it so. In the growth battles that followed, from Old Town’s tower fights to the referendum wars of the 2020s, Prop 420 stood as the benchmark for what organized residents can do in Scottsdale when they decide something is not for sale. The rest of the year is at 2018, and the fight’s full context is in the 2010s chapter.