Located in

Waterloo, Iowa Waterloo is a city in and the county seat of Black Hawk County, Iowa, United States. As of the 2020 United States Census the population was 67,314, making it the eighth-largest city in the state. The city is part of the Waterloo – Cedar Falls ...

, the Waterloo Diamonds was a baseball team that formed in 1989 and lasted until 1993. A member of the

Midwest League The Midwest League is a Minor League Baseball league established in 1947 and based in the Midwestern United States. A Class A league for most of its history, the league was promoted to High-A as part of Major League Baseball's 2021 reorganizat ...

, they were affiliated with two teams in 1989-the

Baltimore Orioles The Baltimore Orioles are an American professional baseball team based in Baltimore. The Orioles compete in Major League Baseball (MLB) as a member club of the American League (AL) American League East, East division. As one of the American L ...

and

San Diego Padres The San Diego Padres are an American professional baseball team based in San Diego. The Padres compete in Major League Baseball (MLB) as a member club of the National League (NL) West division. Founded in 1969, the club has won two NL penna ...

and the franchise was a descendant of the

Waterloo Hawks The Waterloo Hawks were a National Basketball League and National Basketball Association team based in Waterloo, Iowa. The Hawks remain the only sports franchise ever based in Iowa from any of the current Big Four Leagues. Franchise history ...

. From 1990 to 1993, they were affiliated solely with the Padres. Their stadium was

Riverfront Stadium Riverfront Stadium, also known as Cinergy Field from 1996 to 2002, was a multi-purpose stadium in Cincinnati, Ohio, United States that was the home of the Cincinnati Reds of Major League Baseball from 1970 through 2002 and the Cincinnati Bengals o ...

Year-by-year record

(fro
Baseball Reference
Defunct Midwest League teams Baseball teams established in 1989 Waterloo, Iowa Professional baseball teams in Iowa Baltimore Orioles minor league affiliates San Diego Padres minor league affiliates 1989 establishments in Iowa 1993 disestablishments in Iowa Defunct baseball teams in Iowa {{Iowa-baseball-team-stub