sentences:  The California Department of Water Resources includes San Juan Creek in the San Juan Hydrologic Unit, which includes the coastal watersheds of Aliso Creek, Salt Creek, Prima Deshecha Cañada, Segunda Deshecha Cañada, and San Mateo Creek, which share a similar range of elevations and climate.Elevation in the Hydrologic Unit ranges from sea level to at Santiago Peak (the headwater of Holy Jim Creek, a tributary of Arroyo Trabuco).The climate is Mediterranean, with hot, dry summers and cool, wet winters.