 The wall held back the water and residents showed their gratitude in messages they wrote on the wall.Hurricane Agnes in late June 1972 was blamed for 10 deaths in Lancaster County, eight in Dauphin County, five in York County and four in both Northumberland and Luzerne counties, according to the Susquehanna River Basin Commission.Additionally, a multimillion-dollar fish ladder is being built across the river in Shamokin Dam to mitigate the impediment of the shad migration up the Susquehanna River caused by the annual inflation of the Adam T. Bower Fabri Dam.