Sad thing is this country has no problem building transcontinental oil and gas pipelines, but water? I mean its not like the US doesn't have enough, its the distribution thats the issue. And its not going to get better.
You could pipe in all the water you want - that is not the issue. The areas that burn are very dry and consist primarily of fir trees which make the perfect fuel unlike deciduous trees. In Colorado it can rain a lot and the roads are dry almost immediately. The ground is so dry that the water just runs off.
The Columbia and Colorado rivers flow west from the Continental Divide to the Pacific Ocean, while the Missouri River, the Mississippi River, and the Rio Grande flow east from the Continental Divide to the Atlantic Ocean. So the very areas that are burning get covered with snow and the snow melt runs away from these areas. When they dry up the fires start sometimes sooner.