This week, water levels in Lake Powell hit their lowest point of 2026. The nation's second-largest reservoir is stretched thin. Drought and climate change are adding less water, and demand from cities and farms has not been reined in accordingly. The result is a reservoir that sits less than a quarter full, with more shrinking to come. The reservoir, which is held back by Glen Canyon Dam in Northern Arizona, has seen a long trend of decline going back to the early 2000s.