Mike Weisner added 11 points and Keron DeShields had 10 for the Grizzlies (16-4, 12-0 Big Sky), who also won their 23rd consecutive Big Sky Conference game -- moving them within one win of Weber State's conference record from 1967-70.
Thomas Reuter led the Eagles (6-16, 4-8) with 11 points. Eastern Washington committed 16 turnovers and shot 37.5 percent from the floor.
The Eagles came out hot, opening the game on an 11-2 run. But Montana made quick work of Eastern Washington's lead, ripping off a 26-3 run and cruising from there. The Grizzlies led by as many as 20 after halftime.
Montana was 9 of 11 from the line, improving upon its 76.9 percent free-throw shooting that ranked fifth in Division I entering the game.
Mike Brey is looking at former Notre Dame players to fill two assistant jobs that have opened up with the departures of Martin Ingelsby and Anthony Solomon.
Purdue's 2016-17 prospects got a jolt Wednesday when forward Caleb Swanigan announced he will return for his sophomore season.
Clemson's Jaron Blossomgame says he is withdrawing from the NBA draft and returning to school for a final season.