The Dusky flycatcher inhabits open conifers, conifer-hardwoods, or shrubs in the mountains of Oregon.
A medium-sized Empidonax with a small head and rounded crown, the upperparts are grayish olive to grayish brown, the throat grayish, and the underparts mostly whitish with an olive-gray wash (sometimes yellowish). The wings have two narrow, usually whitish wingbars. The narrow white eye ring and pale lores give the appearance of spectacles.
This flycatcher is a common summer resident in most of its breeding range in Oregon. It is found the entire length of the Cascades, but habitat is limited west of the summit in the north.