The 300-foot slide was reported Monday evening near Eastpoint Drive north of Langley, according to Det. Ed Wallace of the Island County sheriff's office.
Whidbey Island resident Doug Coutts moved into his house about a week ago. He was watching television Monday when he heard a boom.
"I figured it was something in the house that had fallen, I wandered around and looked a little bit. Then I looked out the back and saw that a little bit of the bluff had come down here in my backyard," he said"
Wallace said it appears the slide damaged or knocked down several power poles, causing outages in the area.
No homes were damaged and no residents have been evacuated.
Monday's slide is not in the same area as the destructive March landslide that knocked one home off its foundation and threatened dozens more.