Permanente Creek is a 13.3-mile-long (21.4 km) stream originating on Black Mountain in Santa Clara County, California, United States. Named by early Spanish explorers as Arroyo Permanente or Río Permanente because of its perennial flow, the creek descends the east flank of Black Mountain then courses north through Los Altos and Mountain View, discharging into southwest San Francisco Bay historically at the Mountain View Slough but now virtually entirely diverted via the Permanente Creek Diversion Channel to Stevens Creek and Whisman Slough in San Francisco Bay.