The Wolverines won by game scores of 25-15, 25-22, 20-25, 22-25, 15-9.
"Jody Peterson really came through for us tonight," said River Valley coach Marlene Baumann. "She did some serious damage to them in the fifth game.
"We have some very good hitters and when some are having a bad night, others pick up the pace. It's fun to watch this team grow in confidence with the team and with themselves."
Peterson and Trish Todd led RV in serving, each with a 22-23 effort, with Todd nailing four aces, and Peterson two. Alissa Slota served 16-17, and Katie Carnes was 10-10 with two aces. As a team, RV hit 100-109 serves and 11 aces.
Carnes paced the Wolverines in ace sets with 45 of her team's 54 total. Angie Edwards led the winners in digs with 20, while Marisa Graham tallied six, and Peterson five.
Graham was the leader in attacks with a 65-72 night and 31 kills, followed by Peterson 33-35 and 12 kills. The team registered 141-166 attacks with 60 kills.
Graham also led in blocks with 14, followed by Todd eight, and Slota seven.
River Valley competes in the MVC Tournament Saturday and Monday.