The mountain lion was seen at around 2:30 p.m. near the Crystal Springs Dam west of the San Mateo Highlands, emergency officials said.
To avoid mountain lions, residents are advised to avoid hiking or jogging at dawn, dusk and night, when mountain lions are most active.
Anyone who does see a mountain lion is advised not to run, but instead face the cat, make noise and to try to look bigger by waiving their arms and throwing rocks or other objects.
