I've been thinking about this quite a bit over the last few days. The descent on the Blacktail to Foys trail is really fun. The first 1.5-2 miles is a little bit chunky with loose, sharp rocks and some little drops off of roots. The trail on the whole is pretty flowy and fast singletrack, and the new trail work about 7 miles in adds a bunch of banked turns and overall better route from Blacktail down to Heron Park.
Could it be done on a cx bike? Probably. You'd probably be happy you had that bike on the climb, but I don't think it would be as much fun on the way down. Your HT in the pic above would probably be a pretty fun bike to have on that trail. I honestly think that my Tallboy is about perfect for the descent. The suspension and tires allow me to really rail the turns and pop off the roots and rocks on the way down. I have a really firm lockout on my rear shock which made my time on the road more efficient, but on the trail, I rarely used it.
That said, I think riding my TB on the road out to Lakeside would have felt really slow and inefficient. Since I live in Kalispell, I just had my wife (and kids) meet me for lunch and let me swap bikes. If you were going to shuttle it, you could probably figure out a way to leave a mountain bike in Lakeside and leave your car at Herron park.
One other variation: There is a singletrack section above Lakeside that you could take instead of riding the road. It's a pretty steep climb (there were some climbs I had to get off and push) and you turn toward Herron before reaching the top, effectively missing the upper 1.5-2 mile "chunky" section from the top of Blacktail Mountain. Most people I've seen riding that trail are shuttling it so they can ride down only, but there are some who ride it. I've only ridden it once.
I have an idea of how I'd want to ride it the next time, but it may take me a little while before I want to ride that road again. :-)
Feel free to PM if you want any other info.
Seth
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