Colorado’s biggest water project in decades under construction

PUEBLO — As much as 100 million gallons a day of Arkansas River water trapped in a reservoir for southern Colorado and downriver states is about to take a left turn — to Colorado’s biggest water project in decades.

Construction crews this week began work on the $2.3 billion Southern Delivery System. It is designed to pump water uphill and north from Pueblo Reservoir — through a 62-mile pipeline — to sustain Colorado Springs, which owns the rights to the river water, and other growing Front Range cities.

The cities embarked on this project because water supplies have emerged as a constraint on population growth.

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