I divided my time mainly between the Ridge and the Maintenance Yard.   
On the Ridge I saw Magnolia (3), American Redstart (4) and Black- 
throated Blue warblers.  The Yard yielded the following:
BAY-BREASTED WARBLER
Magnolia Warbler 6+
Chestnut-sided Warbler
Common Yellowthroat
Rose-breasted Grosbeak
Scarlet Tanager
Baltimore Oriole (many)

I addition a Black-throated Blue Warbler and a Tennessee Warbler were  
present in the Stable Area.

Have Fun Birding!

Wallace Kornack
Washington DC