Matthew Wappett, a 53‑year‑old professor from Utah State University, returned from a 16‑day, 225‑mile rafting expedition on the Colorado River only to develop a severe, unexplained illness that has now been reported by at least a dozen other river travelers.
From Dream Trip to Hospital Bed
The journey began on May 18, when Wappett, his wife, two daughters and friends launched from the Lee’s Ferry boat ramp. The group spent more than two weeks handling the canyon’s emerald‑green waters, confronting massive house‑sized waves and enduring a few mishaps, including a daughter’s dislocated shoulder that required surgery.
Wappett, a lifelong white‑water enthusiast who grew up in Fairbanks, Alaska, described the experience as “the trip of a lifetime.” He noted that May offered cold water and hot air, a combination that made the rapids feel especially powerful despite lower water levels.
He reported feeling fine throughout the expedition; “none of us got ill—just the usual aches and pains that come with rowing a 3,000‑pound raft down the river,” he told Outside. The group returned to Logan, Utah, on June 2, and life seemed normal until four days later.
Symptoms and Medical Workup
On June 6, Wappett awoke with a swollen, red knee, fever and intense body aches. An urgent‑care clinic sent him to an emergency department, where doctors placed two IV lines and began a battery of tests. Over the following weeks, specialists screened for COVID‑19, rabies, Rocky Mountain spotted fever, Lyme disease, leptospirosis, hantavirus, dengue fever, valley fever, and West Nile virus, among other pathogens.
All results returned inconclusive. The swelling in his knee later subsided, but fatigue, joint pain and periodic fevers persisted, forcing him to reduce his workload and limit outdoor activities.
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Community Response and Investigation
After posting about his condition in a Facebook group for Grand Canyon rafters, Wappett discovered that his experience mirrored those of roughly a dozen other participants who completed river trips earlier in 2026. The shared symptoms—fevers, chills, joint pain and extreme fatigue—have prompted the National Park Service to open a health‑safety investigation.
Wappett’s case appears to be the earliest known instance, as other affected individuals reported falling ill after his return. The clustering of cases suggests a possible exposure during the river segment between Lee’s Ferry and Diamond Creek, though no definitive source has been identified.
The investigation continues.
It is plausible that a water‑borne pathogen or an environmental toxin could be responsible, given the shared exposure to the river’s flow and surrounding geology. However, without positive lab results, pinpointing the exact cause remains speculative. Continued monitoring and broader testing of river water samples may eventually reveal a link, but for now, the mystery persists.
As summer progresses, Wappett remains hopeful for answers while coping with the lingering effects of the illness. He continues to work remotely, taking frequent naps to manage fatigue, and awaits further guidance from health officials.
He hopes for recovery.
