They're not everywhere but if you take a drive from Boise along Warm Springs Avenue to Lucky Peak Dam and beyond up Idaho 21 toward the Mores Creek arm of Lucky Peak Reservoir, chances are you'll see an eagle.
This critter was sitting in a tree behind the Ben's Crow Inn. I shot the photo with a 300mm lens so I would not disturb it. It's an immature bald eagle.
So far this winter, I've seen golden eagles along the rimrock and sagebrush slopes around the reservoir and bald eagles along the Boise River from the Idaho 21 bridge into the main part of Downtown.
It's a great time to get out and see eagles. It's not a given. It's hit and miss but worth the effort.