Wonderful birds at Little Seneca, Black Hill Regional Park,
Montgomery County, but the light was terrible (I got there very late)

at the 121 bridge/Dam side
Mallard
Canvasback
Eared Grebe
Bufflehead
Canada Goose
Ruddy Duck
Lesser Scaup

121 bridge/10 Mile Creek side
Canada Goose
Bufflehead
Ruddy Duck

Grass trail at end east end of 121 bridge
(outlet faces Visitor's Center & Dock)
American Coot
Mallard
Ring Billed Gull
Red-Breasted Merganser

Mud Trail at east end of 121 bridge
and I do mean mud tail, my boots may never recover,
but it's going to be a spectacular trail when it's finished.
(HONEST -- I didn't see the "trail under construction
do not hike" sign)

in small cove on the west side
Trumpeter Swan !! Life bird for me 
 
in last sheltered cove before it opens out to 121 bridge
Mallard
Ring-Neck Duck
American Coot
Eared Grebe
Ruddy Duck
Bufflehead

I agree with Mike Bowen, I believe there must be at least two eared grebes.
One was in the cove on the west side of the bridge and the other over on
the east side, barely visible, but clear enough.

-- 
~
Rev. Gayle Bach-Watson, UCC
4405 Molesworth Terrace,
Mt. Airy, Maryland  USA
Home: 301-831-3874
Cell: 301-367-9306

If I keep a green bough in my heart, 
the singing bird will come.
Chinese Proverb

A bird does not sing because it has an answer. 
It sings because it has a song.
Chinese Proverb