One of Oregon's rarest and most local breeders, this vocal but somewhat secretive warbler can be heard and sometimes seen in summer in the south central Cascades. The patient observer may catch a glimpse of a chunky, dark-backed bird feeding low in dense willows, sometimes showing its pale underparts with dark streaks. It is otherwise a rare migrant or vagrant statewide, mostly in Spring.
An isolated population of this species has summered and presumably bred in the south central Cascades. No nest has been found in Oregon, owing mainly to the impenetrable habitat. Reports suggest that a small population may breed in the upper Wenaha River area of Union and Wallowa counties, not far from the Idaho colonies along the St. Joe River.