They stock them throughout the Black Hills.
You cannot catch these fish here at the hatchery but they do stock the surrounding lakes throughout the Black Hills with them.
Most any lake in the black hills.
They are used to stock lakes and streams all around the area. I'm not a fisherman myself so I can't say where your best odds are. I would guess bigger streams and rivers (Belle Fourche, Rapid Creek, Cheyenne) or lakes (Keyhole, Belle Fourche, Pactola, Sheridan, Angustora).
Anywhere from Angastora to the south to Iron Creek Lake in the Northern Hills.
Thanks! Your answer is awaiting moderation.