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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 as 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 east 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).〔 This section of a longer report contains several detailed maps on "Soils, Land Features, and Trails", "Vegetation", and "Sensitive Species and Bird Habitat". The full report is 〕 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.〔Cummins, Clint and Jensen, Marc (2003). ("Bouldering, Buildering and Climbing in the San Francisco Bay Region" ), web-page retrieved April 24, 2007.〕 An additional building about halfway up the canyon near Islais Creek serves the Silver Tree Day Camp and the Glenridge Cooperative Nursery School.〔(【引用サイトリンク】title=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."〔Stubbs, Joseph (2001). ("Glen Canyon" ), webpage archived at WebCite (from this original URL ) on 2008-03-12. Stubbs rates Glen Canyon Park as the third most attractive in San Francisco.〕 ==Islais Creek== (詳細は''islay''〔 Gudde found old documents that establish that Islais Creek was originally named after the islay shrub, despite the paucity of islay in this region in recent times.〕) originates in the canyon. It is the largest remaining creek in San Francisco with public access. The bottom of the canyon, where Islais Creek flows, is irregular but moderate in slope, dropping 350 feet (107 m) over a distance of about 1 mile (1.6 kilometer).〔 The creek is surrounded by willow thickets. In earlier times, the creek had an open water channel sustained by a much larger water flow, and was "more of a river than a creek". Urban development has reduced the watershed of Islais Creek by as much as 80 percent.〔 At the southern end of the canyon, Islais Creek enters a culvert which carries it to its exit into San Francisco Bay. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Glen Canyon Park」の詳細全文を読む スポンサード リンク
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