I used to live in Hood River and the people who really know the river are the wind surfers.
They know the currents and patterns like nobody else.
As the weather gets better there will be lots of wind surfers out so maybe they'll see something.
Hood River is a pretty quiet town with a low crime rate. Not too many shady characters running around.
Most people in Hood River would be glad to help anyone who came along.
Good luck on finding her.