The missing, 68-year-old Victor Tseng of Phoenix, fell into the river at approximately 3:10 p.m. Friday without a personal flotation device. He was last seen by members of his party beneath Havasu Rapids.
Tseng stands 5-foot-7, 175 pounds. He has grey hair and brown eyes and was wearing a long-sleeve blue shirt, yellow bandana and tan pants at the time of his disappearance.
The National Park Service is currently searching for him and a missing persons investigation is ongoing.
If he is spotted or information about Tseng's disappearance becomes available, park officials are directing calls to the National Park Service Dispatch phone number, at (928) 638-7805.