Two Alhambra women in their 20s were injured, one critically, in an apparent fall at an Eaton Canyon waterfall on Monday.
The exact circumstances of how the women were injured was not immediately available.
"Unfortunately a lot of hikers underestimate mother nature," Lisa Derderian of the Pasadena Fire Department said, pointing out that a number of hikers are injured in the canyon.
Los Angeles County paramedics and members of the Altadena Search and Rescue team were helping rescue the women, whose fall was reported about 5:30 p.m., Derderian said.
Derderian said about 7:30 p.m. that rescuers thought it would take them at least another 45 minutes to get the women out. Derderian said she thought the second woman's injuries were minor. It was too dark for a helicopter to hoist the women out of the canyon, so they were being taken out on gurneys, Derderian said.