About a mile of bare, cracked earth now lies like a desertscape between the boat ramp at the north end of Lake Mendocino and the water’s edge of a diminished reservoir that helps provide water for 600,000 Sonoma and Marin County residents.

The human-made lake near Ukiah is about 30 feet lower than it was at this time last year, and Nick Malasavage, an Army Corps of Engineers official who oversees operations at the reservoir, said the scene is “pretty jarring.”