SaganagaJoe: "I would assume you checked out the low portage next to the rapids from Seagull to Alpine. The other (longer) portage would definitely not be underwater, and, as far as portages go, actually isn't too bad and was recommended by our outfitter over the other one. Glad you had a good time. "
My first trip to BWCA, in 2016, was similar. Seagull Canoe & Outfitters recommended staying out of the rapids and using the longer portage. It's around 100 rods. It's not easy, but shouldn't break most newbies.
I'm glad you all enjoyed your trip!