The highway has reopened, according to DriveBC at 9:20 pm about six hours after the accident.
South Okanagan Traffic Services says the four-car wreck started when a southbound Mazda 3 was rear-ended by a pickup truck, which led to a chain reaction crash.
The Mazda occupants — a 36-year-old female and her 6-year-old daughter — were seriously injured.
Witnesses who have not been interviewed are requested to contact South Okanagan Traffic Services at 250-499-2250.
Picture: Picture and story from Castamet