Rum River Mallards

The Rum River Mallards formerly the Ironwood Fighting Yoopers are a junior ice hockey team from Isanti, Minnesota based out of the David C. Johnson Arena. The team is a member of the United States Premier Hockey League.

The team began play with the 2014-15 season in the Minnesota Junior Hockey League. The team would end up in the newly formed USPHL Midwest Division along with the membership of the Midwest Junior Hockey League and the majority of the members of the Minnesota Junior Hockey League.

On August 17, 2015; the team's website announced the team was going dormant for the 2015-16 season citing the lack of a full roster and was hoping to return for the 2016-17 season. The team returned in the United States Premier 3 Hockey League as the Midwest Division is being reorganized for the 2016-17 season. On May 16, 2018 it was announced on the team's facebook page that the organization had been sold and would be relocating to Isanti, Minnesota and the team would be known as the Rum River Mallards.