Learn about riparian restoration from Parks & Recreation and Natural Channel Design staff. Free to attend. Held in conjunction with Flagstaff Festival of Science. Pre-registration is required at https://anc.apm.activecommunities.com/coconinoparksandrec/activity/search/detail/561?onlineSiteId=0&locale=en-US&from_original_cui=true Matt Ryan County Natural Area is a 128-acre natural area that includes a spring-fed wetland, one of the rarest wildlife habitats in Arizona. This area forms the headwaters of Oak Creek, a major tributary of the Verde River, one of the desert's last free-flowing rivers.