Bird walk at the Sierra Vista Environmental Operations Park (EOP) led by docents from the Friends of the San Pedro River and other local organizations. The Sierra Vista Environmental Operations Park (EOP) consists of 640 acres and offers fifty (50) acres of constructed wetlands that, along with native grasses provides a bird and wildlife habitat. A convenient 1,800 square foot wildlife-viewing platform, surrounded by native landscaping is located near the wetlands for bird and wildlife enthusiasts.