So I gather from all the posts that your friend has some mobility issues. I haven't been on either the Deschutes or the McKenzie but I have always wanted to fish the Deschutes so that is what I would recommend, from a pure "I wish I could go....." stand-point. But ..... if it were at all possible, I would recommend going to the Seven Lakes Basin in Washington. It is in the Olympic National Park. (I am actually planning a trip there for the first part of August

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It is a little of a drive from Portland, around 4 - 5 hours. Plus you have to hike into the back country to get to the lakes/streams/rivers. The hike isn't too difficult though. The entire loop is roughly 15 miles. There are Brook Trout and Rainbows in the lakes and streams/rivers.
The view is incredible!!! :shock:
I have attached some photos that I found of it on the internet, not my own doing. But I have hiked/camped the Olympics since I was around 10 years old.
That is what I would do!!! Opportunity of a life-time, really!!!!
-Spydey