 For NPR News in the Twin Cities, I'm Emily Reese. County, state, and federal officials continue to monitor the Rapidan Dam near Mankato as the rain-swollen Blue Earth River carves a wider channel around the structure. That channel claimed an electrical substation and a home adjacent to the dam. Further erosion potentially could threaten the building housing the well-known Rapidan Dam store, as well as a county highway bridge. Blue Earth County Administrator Robert Meyer spoke at a news conference late yesterday.