Range and natural history
Adults occupy riffles and runs in clear streams. Larvae use different microhabitats, including areas near weed beds and sand bars. This separation matters when interpreting surveys: sampling fast adult habitat alone may miss the larval stage.
FishBase reports sexually mature adults in Crooked Creek, Oregon, in mid-March. That is a documented local observation rather than a spawning calendar for every stream. Its slender lamprey form and stream residence should be considered alongside oral and body characters when separating it from other lampreys.
