What is this structure?

We saw two of these structures in central Washington. Both were collapsed in a similar way. One was in Cunningham but it was too dark to photograph. This one was in Starbuck. It had a small opening at the bottom that would allow a person to crawl inside it and it had a bit of hay inside. That's all the information I can give you about it. Any information would be appreciated. Thanks!

Collapsing structure - Starbuck, WA