Aliso Creek or Treasure Island

Aliso Creek is a 19.8-mile -long, mostly urban stream in south Orange County, California. Originating in the Cleveland National Forest in the Santa Ana Mountains, it flows generally southwest and empties into the Pacific Ocean at Laguna Beach. The creek's watershed drains 34.9 square miles, and it is joined by seven main tributaries. As of 2018, t…
Aliso Creek is a 19.8-mile -long, mostly urban stream in south Orange County, California. Originating in the Cleveland National Forest in the Santa Ana Mountains, it flows generally southwest and empties into the Pacific Ocean at Laguna Beach. The creek's watershed drains 34.9 square miles, and it is joined by seven main tributaries. As of 2018, the watershed had a population of 144,000 divided among seven incorporated cities.
  • Etymology: Rancho Cañada de los Alisos land grant; "Aliso" means alder or sycamore in Spanish.
  • Country: United States
  • State: California
  • Counties: Orange County
  • Cities: Laguna Beach, Laguna Niguel, Aliso Viejo, Laguna Woods, Laguna Hills, Lake Forest, Mission Viejo
  • Source: Loma Ridge in the Santa Ana Mountains
  • Mouth: Pacific Ocean
Data from: en.wikipedia.org