A group opposing Janesville’s plans to remove a dam on the Rock River has requested a temporary injunction. The Monterey Dam Association will attend a morning hearing in Rock County Circuit Court today (Tuesday). Demolition of the aging dam started last Friday. Janesville city leaders decided to remove it last year after the Department of Natural Resources said it had to be repaired or removed. The dam was built almost 170 years ago. If the work is allowed to proceed, removing it could take another five months.