There is one stretch of highway 59(12-15 miles) between Miles City and Broadus that is pretty rough construction in spots with a 35 mile speed limit. There is also some costruction in the Broadus area at times, but not too bad. The part of Highway 59 between Miles City and Broadus that was under construction for the last two years is finished and beautiful, except for maybe a little seeding and striping. I don't know what kind of an alternate route you could work out directly from Denver, but if you get to Belle Fourche SD, you can go north, I believe it's Hiway 85, to Bowman ND and get on 12 and come straight to Miles City. Or you can get on I 90, if you're not there already, and go to Crow Agency, take 212 to Lame Deer and then 39 thru Colstrip to I 94 west of Forsyth and east to MC. Or you can stay on I 90 till you get to Hardin, go north to Custer and hit I 94 there, which is a shorter route, believe it or not, than the one through Crow Agency. These alternates would be quite a few extra miles and I don't know about construction on them, either. If I were doing it I Would take a chance on 59 thru Broadus, but of course I'm not doing it. Hope I Haven't thouroughly confused you.