Two persistent problems at Johnstown Flood National Memorial are non-native plants that are invading the native plant communities and acidic, abandoned mine drainage that flows through the park. Non-native plants that are highly invasive and threaten the park's resources include exotic bush honeysuckles, giant knotweed and Japanese knotweed. Abandoned mine drainage that flows through the park originates upstream near the communities of Saint Michael and Beaverdale.
Did You Know?
The Dam was originally built by the Commonwealth of Pennsylvania as a reservoir for the canal basin in Johnstown. It took from 1838-1853 to construct and fill, yet the canal system was obsolete by 1854.