[EBB Sightings] Broad-winged Hawk?, Tufted Duck, and others at Lake Merritt

My Birding 101 class birded the north end of Lake Merritt today (Lakeside
Park, Rotary Nature Center), and we got great looks at a Buteo perched in a
leaf-less tree filled with Heron nests on one of the islands.  It looked
small, my first thought was Red-shouldered, but it was a bit small even for
R-S, and it had no hint of reddish plumage anywhere, including what we could
see of its wings/back (not much given the angle)

Here is a further description:

Uniform brown hood grading into heavy, consistent brown streaking underneath
Small white patch in the center of the chest
Clean white under-tail coverts
Single dark sub-terminal tail band.

How rare are Broad-winged Hawks here?  Has anyone else seen a hawk hanging
around Lake Merritt?  Can anyone confirm this as a B-W, or a particularly
redless Red-shouldered?

We also saw one Tufted Duck in the large flock of Greater and Lesser Scaup

Here is the complete (modest) list of the hour we spent at the Rotary Nature
Center

Eared Grebe (NW corner of Lake Merritt)
Pied-billed Grebe (also NW corner of LM)
Clark's Grebe
American White Pelican
Canada Goose
Domestic Goose
Muscovy Duck (domestic and a potential Muscovy X Mallard hybrid (all dark
green, tail feathers and head shaped like a Mallard).
Mallard
Canvassback
Greater Scaup
Lesser Scaup
Tufted Duck
Bufflehead
Common Goldeneye
Ruddy Duck
Black-crowned Night-Heron
Great Egret
Ring-billed Gull
Glaucous-winged Gull
Western Gull
Broad-winged? (Red-shouldered?) Hawk
Rock Pigeon
Belted Kingfisher
American Robin
Ruby-crowned Kinglet
Chestnut-backed Chickadee
California Towhee
White-crowned Sparrow
House Sparrow


- Fred Werner