Yeah, they shrunk in 2022 after I looked it up. In same article from Brad, it is indeed Alaska Fairbanks. UMass is close but not full 100’(they’re 95’) wide.
Link: https://www.grandforksherald.com/sports/und-hockey/und-set-to-play-on-one-of-the-last-remaining-olympic-sized-ice-sheets-in-college-hockey
Kind of bittersweet to see them disappearing. Always found it interesting to see how UND adjusted playing in those rinks.