At Houlton, Brandon Dunn scored three goals to record a hat trick in the victory for the Blackhawks.
AJ Henderson, Jason Collett, Noah Reynolds, Alex Wilde, Gavin Viking and Logan Swallow each added a goal for the Blackhawks. Elijah Matheson finished with 20 saves.
Tom Tibbetts notched a hat trick for the Riverhawks while Kyle Gurney and Hunter Brown each scored a goal. Bryce Gunzinger made 15 saves.