When I saw the above words on a North San Diego map I was intrigued and thought that perhaps it may be a good place to check out. John and I have been to several wilderness areas here in California and quite often we have discovered that those sections of land have no roads into them, and also no parking areas. So we thought it a hopeful omen when we saw road signs directing us to Elfin Forest,and became even more encouraged when Harmony Grove road brought us into a parking lot near a visitor's center. Inside the center we were greeted by a park ranger who was eager to show us all the available trails in the recreational reserve. While John was getting those instructions I wandered over to an area of the room where another park ranger was viewing fly larva under a microscope. She had picked up a water sample containing the larva from the Escondido Creek She pointed out to me the different varieties of larva, as well as parts of their anatomy. It probably is one way the water district does watershed environmental monitoring.