Yesterday (9/7) Dan Eberly spotted a Connecticut Warbler directly  
behind the Nature Center building.

Today (9/8), on the way to the Maintenance Yard (parking lot) I found  
the following warblers:
Worm-eating Warbler
Black-throated Green Warbler
Black-throated Blue Warbler
Black-and-white Warbler
American Redstart

At the Maintenance Yard my fellow birders and I saw the following:
Chestnut-sided Warbler
Northern Parula
American Redstart
Black-and-white Warbler
Common Yellowthroat

Others:
Philadelphia Vireo---likely (Linda Friedland)
Red-eyed Vireo
White-eyed Vireo
Eastern Wood-Peewee
Baltimore Oriole

Have fun birding!

Wallace Kornack
Washington DC