Two bald eagles were sitting on one of these posts built along Tule Lake. It appears that these structures were built for the eagles. The adult was eating what was left of it's meal when we happened along. The adult was wary about us being near and took off, leaving what was left of it's food.
The juvenile was also frightened but found it's chance to grab the remaining morsel and flew off with it. Eagles aren't apt to miss an opportunity!