Wouldn't you just love to wander around there while the water flow is lower. Needless to say, you couldn't do that in the spring. I never could find out what those buildings were? Wait, let me ask Gemini. (what are the covered areas in the photo?) Well I couldn't verify its first answer of observation platforms so I zoomed in more to the photo and asked the question differently (What are these covered structures?) to get what I consider the correct response:

In the photo, the covered structures with the distinctive brown, curved roofs are part of the **Shoshone Falls Power Plant** infrastructure.
Specifically, these are **diversion structures and intake facilities** that help manage the flow of the Snake River for hydroelectric generation. They are managed by **Idaho Power**, which operates the Shoshone Falls Power Plant located at the bottom of the canyon.