Couple notes about Jimbo's & Solotripper's posts;

Personally I won't sweat the EP thing Jimbo talks about. You can call the park office and explain your intent and they'll probably welcome you to stop on BH. Talk to Park Office yourself.

The Namakan current could be strong in spots. But the bridge ST saw the Namakan River from crosses below Lady Rapids and you'll see nothing like that from Quetico River up to 3-Mile.

Plan B (unusual high water), If you feel like the current on the Namakan could ruin your trip. Get an outfitter to drop you off at Wisa Lake and paddle into 3-Mile.