The incident occurred at the park in the 100 block of Boren Ave. around 6:30 p.m.
After she was assaulted, the woman managed to walk to a nearby business to get help. Her condition was not known.
The woman's attacker fled and remains at large. Police do not have a suspect in the case; however, they did find evidence at the park that may prove helpful.
The attack occurred just two blocks from the Bailey Gatzert Elementary School.
No other information was immediately known.