As Line 3 construction rolls on, river crossings draw pipeline resisters This weekend, hundreds of pipeline opponents are expected to congregate in northwestern Minnesota for a three-day event they’re calling the Treaty People Gathering, with a projected large-scale event on Monday, June 7. Written By: Kirsti Marohn / MPR News | 12:30 pm, Jun. 5, 2021 × Shanai Matteson, an artist and community organizer who grew up in Palisade, stands at the site where the Line 3 oil pipeline will cross underneath the Mississippi River. Matteson moved back to the area about a year ago and is staying at the welcome center. She recently rode her bike along the entire Line 3 pipeline route from Superior, Wis., to the North Dakota border, stopping at nearly all of the water crossing locations. (Kirsti Marohn / MPR News)