^^^^These streams are inordinately small.
The Tailrace Creek "could" be modified to facilitate all sorts of natural reproduction with flow rate mods and "universal" strata: Charge "15 bucks" for the "snake" walking tour over a series of wooden bridges with species to identify at appropriate times like "Bird Watching".
End the "walk" at a "pond" against the dam. This would in no way negate the need for the hatchery. It would provide G/F with data for improvement and tourist attraction. IM"H"O:
That is all.