In the am, at Rock Creek Park DC (near the nature center) were Ovenbird, Northern Waterthrush, Blue-winged, Nashville, Black-and-White, Myrtle and Worm-eating Warblers, Wood Thrush, Blue-headed Vireos, Scarlet Tanager, Great Crested Flycatcher, Ruby-Crowned Kinglets and Blue-gray Gnatcatchers. In the pm, at Violette's Lock, Senaca and Sycomore Landing, all on C&0 Canal, Montgomery Co., MD: Palm (5), Prairie, Cerulean, Prothonotary, Black-and-White, Parula (12), Am. Redstart (6), Common Yellowthroat, Myrtle Warblers (ca 150) Red-Eyed and White-eyed Vireos, Eastern Pewee (1), Great Crested Flycatcher, Eastern Phoebe, Eastern Kingbird, Blue-gray Gnatcatcher (ca. 30), 1 Bittern and two Yellow-crowned Night Herons along Sycamore Landing Rd. Gail Mackiernan and Barry Cooper gail@umdd.umd.edu