Near mid-day the gull flock South Platte Reservoir (resting on ice in Arapahoe) had 1 3rd cycle Lesser Black-backed, 1 1st cycle Glaucous, and 3 Thayer's (1 adult, 2 first cycle), along with the Ring-billeds and Herrings. I had a possible candidate 1st cycle Iceland, too, but it soon wandered in among the other gulls and I could not view it well enough. So I'm not sure. After a while most of the interesting gulls (LBBG, GLGU and 2 of the THGU) all took off together with some Herrings, circled up and moved off WSW conveniently into JeffCo listing space. There were very few waterfowl on the reservoir's open water, and one Bald Eagle on the ice.
-- Across C470, a Red Fox Sparrow was along the effluent creek that flows into the South Platte just upstream of the highway (Douglas). The sparrow, presumably the same found there on the 12/20 CBC was along the feeder stream a few 100 yards upstream of C470 Trail in an area where their is no canopy over the creek. The river's outflow below the Chatfield Dam had a Say's Phoebe and American Pipit. A Sharp-shinned Hawk tried its luck with a large Tree Sparrow flock in the offleash dog park. An American Dipper was along the river more or less across from Cottonwood Grove picnic area (upstream of the C470 Trail bridge, and two Greater Scaup were near the highway bridge.
An American Dipper was also further downstream along the Platte near the Mineral briedge in Littleton (Arapahoe). One had been previously reported there in recent days.
David Suddjian
Littleton, CO
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