A three-dimensional topographic watershed model features the park, its trails, and its 13 watercourses in the context of three surrounding bodies of water: Upper and Lower Crystal Springs Reservoirs, Cordilleras Creek, and the estuaries of the San Francisco Bay. Push button-activated LED lights invite prediction and play as visitors explore the trail system, the drainage patterns of the watershed, and the interplay of geology and plant communities. Landscape photomurals of the Bay, Bair Island, and beyond extend the view. A compass rose helps with visitor orientation.
In this Exhibit
Alluvial deposits consist of unconsolidated soil or sediments that have been formed by Edgewood’s streams. The accumulations at Edgewood tend to be heavy clays that expand when wet and shrink when dried. Alluvial deposits can be found alongside streams after a heavy rain. They can also be seen draining down the western slope of the central ridge.
Water at Edgewood
On average, Edgewood receives 21 inches of rain during the Winter rainy season. This rainfall sustains Edgewood’s freshwater marsh, creeks, seeps, and springs, which provide critical habitat for plants and wildlife. These waterways drain either into Crystal Springs Reservoir to the west, or Cordilleras Creek to the northeast. The water in Cordilleras Creek in turn drains into estuaries, returns to the Bay, and flows into the Pacific Ocean.