Reservoir under construction south of Denver, but there’s no water to hold

An armada of giant yellow earthmovers on the prairie south of Denver is racing to dig one of Colorado’s biggest water-supply reservoirs in decades — a hole 180 feet deep across 1,400 acres — designed to wean suburbs off waning aquifers. But the water to fill this reservoir? Not yet secured. The prospect of what critics call an empty bathtub is generating anxiety around Colorado as water managers clash over the last unclaimed mountain river flows.

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