|  | More than 75,000 people 
      attended the May 2001 opening day party celebrating Crissy 
      Field. The former Crissy Army Airfield has been transformed into a beautiful 
      public park and wildlife area. More than 125 migrating and local bird species 
      have been documented by park staff and volunteers in the months leading 
      up to the completion of the restored tidal marsh here. Visitors can also 
      enjoy splendid views, jogging areas, and visitor facilities. The new park 
      is a complete transformation from the uninviting hodgepodge of debris, sheds, 
      and fences that cluttered this area in the northern part of the Presidio 
      just two years earlier. The historic site was home to the U.S. Army Air 
      Corps Coast Defense Air Station from 1921 to 1936. An old sea plane ramp 
      is visible at low tide across the promenade at the east end of the picnic 
      area. Detail 
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