Over his career, which spanned from 1979 to 1995, he played for the Pittsburgh Steelers, the San Francisco 49ers, the Cleveland Browns, the New York Giants, the Philadelphia Eagles and the New England Patriots.

After discovering he had been traded, Bahr left a note on his San Francisco locker stating, "See you in the Super Bowl.

He also kicked what would prove to be the decisive field goal in Super Bowl XXV on January 27, 1991, as the Giants beat the Buffalo Bills 20–19, also recording a tackle on the opening kickoff.

[10] At the time of his retirement, Bahr was the last active NFL player that played for the Steelers in at least one of their four Super Bowl wins in the 1970s.

Career high/best bolded He appeared in the 1980 television movie, Fighting Back: The Rocky Bleier Story.