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Rio Relay event flyer with details

Rio Relay River Cleanup 5K

8 a.m. – 2 p.m., April 18, 2026

Image of water with brown hills behind the water and the words Nature Trek at El Rio Preserve

El Rio Preserve Nature Stroll (Late April)

8 – 9:30 a.m., April 23, 2026

A collection of images from the Sonoran Desert including cactus, birds, dragonfly and moon,

Signs of the Season Phenology Walk Late April

8 – 9 a.m., April 26, 2026

Image of the flowing Santa Cruz River

Living River Ramble April

9:30 – 10:30 a.m., April 26, 2026

Santa Cruz River Research Days words with green leaf

Santa Cruz River Research Days | Días de Investigación del Río Santa Cruz 2026

All Day, April 28 – 30, 2026

Santa Cruz River Restoration (Tubac)

9 – 11 a.m., May 20, 2026

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We respectfully acknowledge the University of Arizona is on the land and territories of Indigenous peoples. Today, Arizona is home to 22 federally recognized tribes, with Tucson being home to the O’odham and the Yaqui. The university strives to build sustainable relationships with sovereign Native Nations and Indigenous communities through education offerings, partnerships, and community service.

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