Jan. 7—Hilda Ochoa first showed a bisected slide of Lake Berryessa's so-called "Glory Hole," the 72-foot diameter bell-mouth spillway that drains excess water from the lake into Putah Creek.

Only a 90-minute scenic drive from downtown San Francisco, Lake Berryessa is a relatively new ... known as the Monticello Dam Morning Glory Spillway, because excess water overflows the top when ...