The Sierra Vista  Environmental  Operations Park (EOP) is open to public bird watching  tours on Sunday mornings year round. Group size is limited to 15 people, first-come, first- served. Arrive before the starting time to sign a waiver and secure a spot. The 2-2.5 hours walk is behind locked gates and you must stay with the group. Bring water, hat, and binoculars. A bird checklist will be provided.