Blacktail Deer Creek is a small stream in southwestern Montana flowing through the Beaverhead Valley. The creek holds brook trout and some cutthroat trout in its upper reaches. This is intimate small-stream fishing requiring stealth and short casts. Access is limited with some public land and willing landowner situations. Best fishing is summer and early fall when flows stabilize. The creek offers solitude for anglers seeking an alternative to the famous Beaverhead River nearby.