About 90 percent of the Colorado River's water comes from snowmelt in the Upper Colorado River Basin, a large swath of Colorado, Utah and Wyoming.
One of the worst recorded droughts in human history has stretched water supplies thin across the far-reaching Colorado River basin, which serves 40 million people.
About 75 people across the state work in remote areas keeping a watchful eye on the state’s water supply.
Northern Water wants to build two large reservoirs using the Cache la Poudre's water. History suggests it won't be easy.