US, Maryland - imm. Warbler ID (1 Viewer)

Hello. I took these photos of an immature warbler two weeks ago at Blackwater NWR, near Cambridge, Maryland. The site was at the boat ramp for Fishing Bay that leads out to the Blackwater River. There were two or three of these warblers in an out of the reeds and brush at the side of the parking lot. They were always within 3 feet of the ground. I did not see an adult bird with them. I have not been able to positively identify the warbler species. The best I can figure out is possibly a young Mourning Warbler but this is not their preferred breeding habitat which is more boreal forest areas. Please lend a hand with the ID.
Thanks,
John

I think that it's a young common yellowthroat

I agree with Common Yellowthroat, juvenile. With that dark spot under the eye, it looks like a male.

Thanks folks. Common Yellowthroat makes more sense given the habit where the birds were observed.