The 100-foot-high hillside began sliding April 4, and 42 homes and apartment units were evacuated April 9. At that point the slide was moving about one inch per day.
Officials said the landslide, which is located in the Jackson Hole valley, isn't likely to liquefy and become suddenly destructive like the mudslide that killed 39 people in Oso, Wash., on March 22.
"Is it weeks, is it longer? I really don't know," said George Machan, a landslide specialist working with the town. "I think it's really unpredictable how long it might take. I don't expect it to end in a day."
Live webcam footage of the slow-moving landslide has been posted online.
[Casper (Wyo.) Star-Tribune]