A massive uranium tailings pile between Arches National Park and Moab sits right beside the Colorado River, leaking radioactive and toxic debris into water that is eventually used for agriculture and drinking by 30 million people downstream in Arizona, Nevada, and California. Because one enormous flashflood could wash tons of that radioactive milling waste into the river, a $300 million federal clean-up is underway. Taxpayers will pay for 16 million tons of uranium milling waste to be moved away from the river.