I've done the trip form whitney to dicks, for me its a good day trip, and when they let water out when you are several miles downstream it didn't seem dangerous, just faster water, but I never did it with youngsters.
The 10 mile at Rochelles I've never done, although I've done the trip from to dam to Rochells many times.
The one at rochells you wont be getting any water level surprises though. (Less likely)
You were not planning on overnight camping during this paddle right?
That would change my response-
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