The Washington State Patrol says no people were injured in the collision at 9 p.m. Monday but all three vehicles had to be towed away, including a 2000 Dodge Dakota pickup that was totaled.
Trooper Russ Winger says elk are occasionally hit on Olympic Peninsula highways, but that number of animals killed at one time was unusual.
State Fish and Wildlife spokesman Craig Bartlett says two wildlife agents responded to the scene and euthanized seven injured animals. The carcasses were donated to area Indian tribes.
Bartlett says a herd of 75 to 100 elk roams the area but it's unknown how many were on the highway at the time.