Jamal Webb added 11 points, seven rebounds and seven assists for the Green and White (13-15, 10-8 Big Sky), which maintained its hold on third place in the conference standings. Shane Benton had 10 points.
Portland State (8-17, 5-12), which had its three-game winning streak snapped, is in danger of being eliminated from the Big Sky tourney, which takes the top seven teams. The Vikings are three wins behind the seventh spot in the conference with three games remaining.
North Dakota swept the season series, also defeating the Vikings 85-76 on Jan. 19.
Maryland point guard Melo Trimble, considered a lock to leave the program before struggling in the second half last season, has withdrawn from the NBA draft and will return for his junior season.
Louisville's Chinanu Onuaku, who recently underwent a medical procedure to correct a heart rhythm issue detected during the combine, will keep his name in the NBA draft pool.
Andrew White III will return to the Nebraska men's basketball team next season after removing his name from the NBA draft.