326M: Boy Has Adventures On River

I’m looking for a children’s picture book from the 70s or 80s for my friend. Her mom used to read it to her, but she can’t remember the name. It’s about a boy who floats down a river and has many adventures on the way involving animals and food. She thought it was “In the Peanut Butter Colony” by Louis Ross but that doesn’t look right after all.  Thank you for any help!
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