Juvi White-throated? When I was filling the pond, it flew into the backside of the pond. The foliage is so thick back there that you can't really see anything. All I knew was that a small reddish bird had flown into the back. Then I saw it by the patio eating grass seeds. Coloring is similar to Swamp Sparrow. It was pretty small though like a Lincoln's. I don't know what the heck it is. Only 2 bad pics before it disappeared back into the thick foliage around the pond.
I have looked at this bird several times now and still haven't come to a conclusion. But since it has been days without a reply, I thought I'd put in something. :)
If I had to lean one way, it would be an immature Swamp sparrow. A Lincoln's crown would be more streaky, even at the young age, but the crown of the Swamp would be brown or black. (From All About Birds)