JACKSON, Wyo. (AP) — A remote landslide has created a deep lake in western Wyoming.

Bridger-Teton National Forest officials aren't sure when the mountainside gave way in the Wyoming Range south of Jackson.

A forest official looking for wildfires from an airplane spotted the landslide just recently in the Willow Creek drainage.

Outfitter Dustin Child says he rode a horse to see the landslide on the ground. Child says the landslide is up to 200 feet deep and has blocked off a creek, forming a 15- to 20-acre lake.

Child estimates the lake is 30 to 40 feet deep.

He says the landslide has cut off a trail and the debris field is steep and difficult to cross.