Water levels at several Bay Area reservoirs have reached historical lows — just one of the devastating environmental impacts of California’s punishing drought, the Santa Clara Valley Water District said Wednesday.

Reservoirs operated by Valley Water, the main provider in Santa Clara County, were 85% full in April 2017, the agency said. As of Wednesday morning, they were at 12.5%. Then-and-now images illustrating how low the reservoirs have dwindled reinforced the agency’s grim report.