Just below this spring is an amazing water filtration system. Rocks and sand filter rain and melting snow as it travels underground from the Valley rim. Fern Spring flows even during the driest part of summer, slowly releasing moisture from winter precipitation.
American Indians consider this spring not only a source of water, but as a source of life. This place has great spiritual significance. Out of concern and respect, local residents and Yosemite Indians worked with the National Park Service to restore this area. They removed litter, protected native plants, and planted ferns which once grew here in abundance.