Greetings All
I was pondering with Nick Moore success, vs lack of, in pursuit of yonder Arctic Loon.
The Arctic Loon seems to hang around (at least Saturday) back towards the far western portion of the reservoir. Walden Reservoir can be confusing. First of all, it is oriented largely north/south. Additionally, it is easy to think you are nearing the northern end when you are not.
The road along the eastern side of the reservoir is a track, mostly, sometimes requiring care due to ruts.
Walden ends to the north in one last lobe bordered by (in part) a rocky rim. It is also most pinched off just before this last lobe.
The loon was best viewed just south of that "pinch," at about 40.741488 -106.319239
I do wonder if some folks did not go quite far enough north. The Common Loon spent most of its time a couple of hundred yards to the south of the Arctic.
Good Luck and Good Birding
Steve