It is for these reasons that the concert venue at Northerly Island is a temporary structure. At the end of each season it is disassembled and stored for the winter, returning the artificial island to its natural state. This is particularly important in the Spring and Autumn because since the island was built, it has become a popular rest area for migratory birds.
Like it, or hate it, building a temporary concert venue that handles 8,000 people is quite a feat. Even the welcome sign is temporary. The only permanent parts are the pavement, lights, and electrical junctions.