Harborview Medical Center spokeswoman Liz Hunter says there's been no change in his condition.
His son James Bach said Sunday his father was lucid and had improved since the accident Friday left him with a head injury and broken shoulder.
Bach, 776, had a New York Times No. 1 best seller in 1970 with "Jonathan Livingston Seagull." About 20 years ago he moved to Orcas Island.
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