Huay Xai to Luang Nam Tha is doable right now if you like riding in a construction zone 183 km long. The first half to Veing Phouka is still dusty and you have to put up with a lot of truck traffic. Some areas are cleared up to four lanes wide, dirt, while other areas you are still riding "goat tracks". No real logic to how they are working the road, but is definately dirty and dusty. Some areas had signs warning that the road would be closed for 15 minute periods while they worked in the road. We were stopped once while they cleared and moved dirt around with road graders. Don't even think about trying it if there is rain.
From Vieng Phouka north, many of the water crossings have had temporary bridges constructed but there are still a few streams where you are going to get wet. Also most of the log bridges have now been covered with dirt. I think only about 3 are left that you need to be careful crossing.
It is a full days ride to make it all the way to Luang Nam Tha and then we found that many backpackers seem to be going there and most of the guesthouses were full.
Dave Early
Ever notice that "What the Heck!" is usually the right answer?