The zoo closed from 1978 to 1980 to undertake an upgrade project. A children's nature center was added, as well as a naturalistic polar bear exhibit, a boardwalk through a wetlands area, and a North American bison exhibit.
The zoo closed from 1978 to 1980 for a renovation project that included the addition of a children's nature center, a naturalistic polar bear exhibit, a boardwalk through a wetlands area, and a North American bison exhibit.