Coincidentally, I also birded from Prospect Ponds to and through the ELC today (Sun) around noon. I ran into a couple of groups of birders, but not Dave. I had a similar experience, not a lot of them but some good ones. I missed the Chestnut-sided and Redstart and dipped on the entire suite of Swainson's, hawk, thrush or warbler.
Highlight of the day a juvenile dark morph Broad-winged Hawk flying over northern section of the ELC
https://flic.kr/p/sbcczYBlue Grosbeak in northeast corner of southernmo... same place Dave saw Chestnut Warbler and low in willows. Had a Clay-colored Sparrow nearby feeding in the willows too.
4 Western Tanagers(FOY for me), 1 male in full regalia, my vote for most colorful Colorado bird.
Gray Catbird (FOY for me) in SE corner of ELC.