Apparent cracks in the dam at Twain Harte Lake, a small swimming spot in the mountain town, prompted officials to lower the level Sunday.
The water was being drawn down about 10 feet so inspectors could confirm the cracks, the National Weather Service reported. It said there was no risk of dam failure.
The weather service issued a flood warning Sunday morning but then lifted it later in the day. The lake drains into Sullivan Creek, which in turn feeds the small Phoenix Reservoir and the large Don Pedro Reservoir. All of the water bodies are suffering from the severe drought.
Twain Harte Lake, operated by a private association, was created a few years after the community was founded in the 1920s. It is open to members and authorized guests.