The oasis at Fields (Birding Oregon p. 19) is a tiny site, but one of the better known hotspots in Oregon. This little clump of willows around a spring is surrounded by miles of sage steppe, so it is very attractive to species normally found in woodland habitats.
The big attraction for birders is the possibility of vagrants from the east. On this day a Northern Parula was the highlight. Other eastern warblers had been found the week before, and still others appeared later. One never knows what will show up on a given day.