Santa Ysabel Open Space Preserve is growing in size.
Santa Ysabel Open Space Preserve is within the San Dieguito River watershed that is the drainage area from the rivers’ headwaters in Volcan Mountain to the Pacific Ocean via the San Dieguito Lagoon in Del Mar.
http://m.sandiegoreader.com/news/2015/nov/04/roam-santa-ysabel/?templates=mobile