I agree with the previous two posters. Having just stopped at the spring for a drink before heading down to Big Tree, I took a look at the route up to the tarn. No way. I have come down that way before, but that was in the early summer of a big snow year. We boot skied all the way down from the tarn through monster sun cups. It was a lot of fun. Last year around this time I walked off the back of the tarn to take a look and was less than inspired.
The water below Mineshaft Flats is flowing well now, and is some of the coldest water you can drink. I’m not sure about Labor Day flows though.