The museum is housed in the former Cambria Public Library, which is part of the Downtown Johnstown Historic District.

The museum shows the documentary, The Johnstown Flood in the Robert S. Waters Theater.

Exhibits include the relief map that uses lights and sounds to display the path of the flood.

It is a three-story brick building with a tile roof encased in dormers in the French Gothic revival style.

In January 2025 the museum, but not its contents, were damaged when cold weather caused a water valve to leak on the third floor.