The stadium was the site of the 1978 Midwest League All-Star Game on June 6, 1978.

The Midwest League team, last known as the Waterloo Diamonds, left Waterloo to become the Springfield Sultans before the 1994 season after the city of Waterloo failed to improve the stadium to meet Major League Baseball's newly imposed standards for minor league ballparks.

The Diamonds evolved into today's Lansing Lugnuts of the Midwest League.

[citation needed] The University of Northern Iowa played home baseball games at Riverfront Stadium until U.N.I.

The last game played by UNI at the stadium was on May 16, 2009, a 3–2 win against Bradley University.