Large sparrow with dirty gray breast and golden colored crown bordered by dark brown wide lines.  Some yellow below these lines over the eye. Crown itself not extending beyond front of head; thin gray striping top and back of head. Pink legs, 2 white wing bars also noted. A bicolored bill was noted when the photo was viewed. There was also a thin brown eyeline that likely indicates a first winter bird thus my notation of transitional plumage.  

The bird was hopping, walking and pecking on the narrow metal grated walkway that crosses the fish raceway.  These often have remnants of algae, small fish fragments, and fish food on them. The bird flew down briefly to the dirt road next to the raceway and then flew into the thick brush that lines a fence along the hatchery when one of the fish feeding trucks approached.  Beyond the brush is a slightly more open area and then larger cottonwoods. The bird was not seen after it dove into the deep brush although I waited in the area another 30 minutes.  

As far as I know no one else had reported this bird here before I saw it on March 9, 2022.

I watched the bird again on March 11th.  This time it was feeding on the edge of the dirt road next to the fence.  I noticed some fish food buried in the gravel and grass in that area.  I watched it for about 15-20 minutes.

I didn't really consider any other species.  

I have seen this bird before in Colorado at Red Rocks and in Alaska,  so I knew what it was, but wondered about the dark brown (not black) crown border, crown not extending very far back onto the head, and eyeline, for that I checked Sibley.

I have seen this sparrow at Red Rocks where long looks under the feeder were possible.  I have a fair amount of experience with sparrows in general both living in the midwest (Ohio) and in Colorado where I've done BBS routes.