Donut Bay nearby appears to offer conventional anchoring but its not as scenic. No anchoring in Pothole Portage Bay! Forty feet deep right up to the surrounding cliff walls. Even at 3:1 scope the swinging circle would be too large. Tied up to two trees on opposite sides of the bay.
Took a long dinghy trip (rowing; too many portages to bring the outboard) west all the way to the highway to Whitefish Falls. Bay of Islands is just across this highway.