It seems to have worked pretty well aside from the obvious radioactive fallout problem. They successfully turned a dry river bed into a lake that still exists today.
This is about the same as the local natural background dose.
https://www.sciencedirect.com/science/article/abs/pii/S02659...
You can estimate your personal yearly dose with this calculator, though for me it only works in firefox.
> "the current external γ-ray dose rate to a human from the contaminations associated with the 'Taiga' experiment was between 9 and 70 μSv [micro-Sieverts] per week". The report also recommends periodic monitoring of the site was recommended. In comparison, typical exposure from naturally occurring background radiation is about 3mSv per year, or 57μSv per week