We've trapped a few of these over the years for various reasons - most recently for Joel's Kids Day at Royal Treatment Fly Fishing; I can certainly say the ones we've come across so far on the Clackamas and that creek behind our house in Portland have all be the 'good' ones....BUT if you come across others - keep 'em and eat 'em [and let ODFW know...]:
SALEM, Ore – Ringed crayfish have successfully invaded many rivers and streams in southern Oregon, but were just found in Lane County’s Row River. This is the first discovery of this species in the Willamette River drainage.
“To find Ringed crayfish in the upper end of the Willamette Basin is very alarming to us,” said Jeff Ziller, South Willamette Watershed District Fish Biologist. “Ringed crayfish have been found to out compete our native Signal crayfish for habitat and food. The non-native ringed crayfish dominate the crayfish populations in the Rogue, Chetco and Umpqua rivers, so this is bad news for Signal crayfish here in the Willamette system.