Hi, Linda & all. There have been at least three Red-eyed Vireos there this summer:
I don't agree that the bird or birds necessarily are breeding there. They might be. But the presence of singing Red-eyed Vireos doesn't necessarily confirm breeding. It was Christian Nunes, I believe, who made an analogous point with regard to the amazing Baird's Sparrows of Larimer County--although with the Baird's Sparrows, the evidence, while admittedly still circumstantial, is quite tantalizing.
While I have y'all's attention, I'll mention that there's at least one--and probably only one, haha--spot in Boulder County with shorebird habitat. On a tip from one of my invisible companions on the Aug. 13 Perseids trip, I went down to Stearns Lake, barely Boulder County, the morning of Friday, Aug. 14, where I found:
4 Snowy Egrets
1 Bald Eagle
1 Virginia Rail
14 Killdeer
8 Spotted Sandpipers
1 Solitary Sandpiper
2 Least Sandpipers
1 Wilson's Snipe
Chipping, Brewer's, Lark, Vesper, Savannah, and Song Sparrows, plus Lark Bunting
2 Great-tailed Grackles
Ted Floyd
Lafayette, Boulder County