Montana State (7-13, 4-3 Big Sky Conference) rallied from 14 points down in the second half to win its third game. Carlos Taylor added 11 points for the Bobcats.
Northern Colorado made 9-of-10 shots and got five points from Sean Taibi to start the second half and build a 47-33 lead.
But the Bears cooled off and Montana State went on a 19-5 run, capped by Taylor's short jumper that tied the game with 5:17 left. Dissly's rebound basket put the Bobcats ahead 54-52 and his two free throws made it a 56-53 game with 1:36 left.
Northern Colorado pulled to within one, but Durham made it a 3-point game with two free throws with seven seconds left.
Taibi's potentially tying 3-pointer was tipped in at the buzzer by Chris Kaba.