Pacifica straddles San Pedro Creek, which flows from the western slope of Sweeney Ridge. The middle and south forks, in San Pedro Valley County Park, are steelhead spawning grounds. The Portola expedition followed this creek and San Andreas Creek on the other slope in finding San Francisco Bay.
Questions people ask
Do steelhead spawn in Pacifica?
Yes: the middle and south forks of San Pedro Creek in San Pedro Valley County Park are steelhead spawning grounds.