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The Magnesia Spring Ecological Reserve, a 3,800-acre area, was designated a nature reserve by the California Department of Fish and Wildlife in 1975. It is home to wildlife such as the Peninsular bighorn sheep, Coyote, Bobcat, Gray fox, Prairie falcon, Golden eagle, Gambel's quail, and Mourning dove. It became a reserve to preserve and rehabilitate both habitat and access to fresh water sources for the Bighorn sheep. Hiking is permitted in the reserve parts of the year. It can be accessed from trails such as the Mirage Trail and Magnesia Spring Falls Trail. It can be reached by following the trail to Magnesia Falls, which has its trailhead at Blixseth Mountain Park, next to Rancho Mirage Elementary School. This trail leads to a variety of oases and waterfalls in the Santa Rosa Mountains and is closed from January 1 to September 30 in order to protect the endemic Peninsular bighorn sheep. Lower Magnesia Falls is 2.5 miles roundtrip from Blixseth Mountain Park, while the Upper Magnesia Falls waterfall is a 6.5-mile roundtrip hike. This trail eventually joins the Art Smith Trail.