A climber who plunged some 700-1,000 feet was declared dead on arrival at a local hospital, according to the Clackamas County Sheriff Office. His identity was not immediately released pending notification of family.
"The other group of climbers are still up on Hogsback -- we estimate 7-8 climbers at this time. One is injured but the injuries to not appear to be life threatening," the sheriff's office posted on Twitter.
Rescuers made their way up the mountain, and were helping three climbers in one group come down.
Additional rescue crews were trying to help a separate group of four, at least two of whom were injured, the sheriff's office said.
At least 46 people have perished on the summit -- a popular hiking destination east of Portland -- just since 2002.
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