There was a bit of a large gull fall out late this afternoon on the 
Potomac River in Washington County near Harpers Ferry.  In the area of C&O 
Canal Lock 34, there were 10 Herring and 4 Great Black-backed Gulls.  If 
I'm reading the yellow book correctly, the Black-backs are good birds for 
Washington County.

The gulls topped off a long and productive day in Washington County, the 
highlights of which are listed below:

Washington Monument SP, Appalachian Trail
8 Fox Sparrows

Boonsboro sewage ponds/Monroe Rd.
3 Killdeer
1 Tree Swallow
3 Savannah Sparrows
2 White-crowned Sparrows

Big Pool
1 Horned Grebe
6 American Wigeon
4 Gadwall
10 Ring-necked Ducks
2 Lesser Scaup
6 Common Goldeneye
4 Hooded Merganser
4 Common Merganser
2 Eastern Phoebes

Little Pool, Potomac River
10 Wood Ducks
8 American Black Ducks
5 Hooded Merganser
5 Red-breasted Merganser
1 Fox Sparrow
30-40 Rusty Blackbirds

Williamsport, Potomac River
2 Killdeer
12 Ring-billed Gulls
50 Tree Swallows
2 Northern Rough-winged Swallows

C&O Canal Lock 34, Potomac River near Harpers Ferry
5 Double-crested Cormorants
1 Great Blue Heron
20 Wood Ducks
4 American Wigeon
Many Mallards and black ducks
3 Blue-winged Teal
6 Common Merganser
20 Black Vultures
30 Turkey Vultures
4 Great Black-backed Gulls
10 Herring Gulls
1 Eastern Phoebe
200+ Tree Swallows
1 Northern Rough-winged Swallow

John Hubbell
Washington DC