Sgt. Nick Watt, search-and-rescue coordinator for the Clackamas County Sheriff's Office, said the climber, tentatively identified as Pat Martuson of Salmon, Idaho, was near the base of Crater Rock when he fell sometime early Thursday.
Watt said a nearby climber saw the injured man and contacted a member of the ski patrol, who called 9-1-1 at 9:52 a.m.
Deputy Joel Manley, a sheriff's spokesman, said two rescuers reached Martuson just before noon and called for additional help from 10 members of Portland Mountain Rescue. They brought Martuson off the mountain on a litter.
He was taken by ambulance to a Portland hospital.
"The weather was nice, and there was no immediate medical need to call for a helicopter to bring him off the mountain," Manley said.
Crater Rock is a prominent landmark on the mountain's well-used south-side climbing route, located between Steel Cliff and Castle Crags just below the summit. -- Stuart Tomlinson