Tony McPherson had four catches for 101 yards, including a 76-yard touchdown on the second play of the game, for Boise State (11-1, 7-0), which posted its 18th consecutive home victory.
The Broncos, who improved to 21-2 since joining the WAC in 2001 and winning the conference for the second straight year, scored 184 points in their final three home games.
Dinwiddie opened up a 21-0 advantage after one quarter on a pair of one-yard runs and completed TD passes to David Mikell, T.J. Acree and Lawrence Bady in the second quarter as the Broncos took a 42-0 lead into the break.
Andy Heiser went 8-of-24 for 89 yards and three interceptions for Nevada (6-6, 4-4).
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