The Colorado River Basin provides water to 40 million people and supports extensive agricultural operations. The rapid depletion of groundwater, particularly in the Upper Basin, threatens to exacerbate water shortages and reduce groundwater contributions to rivers. This could intensify the feedback loop between surface-water shortages and groundwater loss, further straining the region's water resources. The study underscores the urgency of addressing this issue to prevent long-term impacts on water availability and ecosystem health.