Spring in Glen Canyon Park. Field mustard in flower clings to the stony canyon walls; Islais Creek and its willow thickets lie at their base. Glen Canyon Park in winter. The photograph shows three characteristic features of the park's landscape. The vividly green wild oat (Avena fatua) and slender wild oat (Avena barbata) grasses on the left cover the steep eastern slope of the canyon. The line of blue gum eucalyptus trees is a windbreak planted in the 1850s following Adolph Sutro's purchase of this land, which he named his "Gum Tree Ranch". The willow thickets in the bottom and bottom-right of the photograph surround Islais Creek and a small wetland; the wetland is traversed by a boardwalk leading to the trail seen emerging from the thicket. Glen Canyon Park is a city park in San Francisco, California. It occupies about along a deep canyon adjacent to the Glen Park, Diamond Heights, and Miraloma Park neighborhoods. O’Shaughnessy Hollow is a rugged, undeveloped tract of parkland that lies immediately to the west and may be considered an extension of Glen Canyon Park. The park and hollow offer an experience of San Francisco's diverse terrains as they appeared before the intense development of the region in the late 19th and the 20th centuries. The park incorporates free-flowing Islais Creek and the associated riparian habitat, an extensive grassland with adjoining trees that supports breeding pairs of red-tailed hawks and great horned owls, striking rock outcrops, and arid patches covered by "coastal scrub" plant communities. In all, about of the park and hollow are designated as undeveloped Natural Area. Elevations in Glen Canyon Park range from approximately 225 feet (69 m) above sea level at the south end of the park to 575 feet (175 m) above sea level at the north end and along the eastern rim of the canyon; the walls of the canyon are extremely steep, with many slopes approaching a length-to-height ratio of 1:1 (100 percent). Formal recreational facilities in Glen Canyon Park are mostly located at its southern end (see the aerial photograph). These facilities include a community recreation center, ball fields and tennis courts, playgrounds, and a ropes course. The park is also well used by local rock climbers, who consider it one of the best "bouldering" sites near San Francisco. An additional building about halfway up the canyon near Islais Creek serves the Silver Tree Day Camp and the Glenridge Cooperative Nursery School. The park is easily entered at its southeastern corner (end of Bosworth Street). Somewhat further north, there is a wooden stairway leading down into the park (the Sussex Street entrance). There are also trails leading into the park from the Diamond Heights Shopping Center. Of one of these, Joseph Stubbs has written, "It is a dramatic, sudden revelation of the park interior from high up, which is simply stunning. It occurs midsection of the park behind Diamond Heights Shopping Center and George Christopher Playground."
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