 now playing only in theaters. For NPR News in the Twin Cities, I'm Phil Picardi. 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.