AW is your friend! (I'm assuming you're a member - if not, you should consider).
On the AW website go to the river pages for the Grande Ronde. There you'll find that the BLM manages the stretches Minam down. A quick Google of "BLM Grande Ronde" will reveal all. .
Permits are required for Minam down, are self issue, and are available at most river access sites (which are listed on a downloadable PDF).
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