Alec Wintering and Jarrel Marshall hit back-to-baskets to close the first half and cut the Boise State lead to three at halftime, 43-40. Bryce Pressley made back-to-back 3-pointers to open the second to give the Pilots a 46-43 lead.
Webb tipped in a missed shot and Mikey Thompson and Drmic made consecutive 3-pointers to start a 17-2 run to put the Broncos up 60-48.
Wintering scored 26 points to lead Portland (4-5).
Under coach Leon Rice Boise State is now 85-17 when scoring 70 or more points.