The incident happened just before 7 p.m. in the 12500 block of W. Sheldon Street.
Los Angeles Fire Department firefighters used a rope to rescue her from the ditch.
#Injuries; INC#1149; 6:50PM; 12500 W Sheldon St; https://t.co/eaFOiNlIKh; #SunValley; Incident Now Closed;Firefighters conducted a technical rope rescue to safely retrieve adult female patient who fell in an approx 25' draining ... https://t.co/0JOJoRXRDB— LAFD (@LAFD) November 25, 2018
She was taken to a nearby hospital in unknown condition.
Investigators are looking into what caused the woman to fall.