The 1889 Johnstown Flood occurred during Roberts 's presidency . The PRR 's Stone Bridge over the Conemaugh River in Johnstown acted as a dam , trapping debris that covered 30 acres ( and soon caught fire ) . The PRR was a major participant in the rescue effort . It reopened its line to Pittsburgh within 3 days , and was the primary means by which relief workers and provisions reached the victims of the disaster . The Stone Bridge still stands today
Johnstown Flood
Johnstown Flood
George Brooke Roberts