Emergency Medical Services personnel attended to a woman who apparently had nearly drowned in Nuuanu Stream near River Street in Chinatown.
The call came in around 8:30 p.m. Friday. She was found floating face down in the water.
A firefighter who was part of the response team jumped into the stream and pulled her out, using a ladder.
CPR was performed on the unidentified woman and she was then taken to a nearby emergency room in critical condition.