I just burned a large slash pile from the logging we did two years ago. I've never had the best time to burn. The loggers made 4 large piles spread about my property. I burned one the first winter after logging, maybe 2 weeks later. It was the smallest. Set it on fire and walked away. Came back a few hours later and pushed the half burned sticks and logs to the center to keep going. The second one was this spring. A bit larger. The WA State Department of morons decided to impose a burn ban in APRIL because we had a dry spring. The Fire Department came out, but the pile went up so fast, it was a smoldering pile of ashes when they arrived. They didnt fine me as that was the first day of the ban. That fire continued to smolder for a few days.
Yesterday, I went out and lit the third pile. This pile is the next largest. Probably 10 feet high, 30ft by 100ft rectangle of logs up to 8" in diameter combined with sticks as small as pine needles, all jumbled up into this massive pile. We currently have temps around 19F and about 2" of snow. The pile, though in the 'forest' is in a open area with the closest douglas fir about 30ft away. It took me about 2 hours to get it lit using nothing but a propane torch. Even though the material was well seasoned, the snow and dampness, rot, and unevenness of the material made it extremely hard to lite. But once it started, about noon yesterday, it went. It wasnt as fast as I hoped, but it did burn the majority of the pile throughout the night. It did leave behind the larger logs (the logs couldnt be harvested because of how crooked they were. They were diseased) So, now I do have a mess to clean up.
Now, some of you might be getting a bit freaked out when I said "Set it on fire, and walked away" or "it did burn the majority of the pile throughout the night." Understandable, how can anyone living in the forest leave a bon fire raging over night?! Calm down. The piles are in open areas, surrounded by snow. Everything is wet. Besides, I can see every pile from my house windows, and I monitored them while they were burning, from the comfort of my living room (it was 19F yesterday.

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So what do I do with the ash pile? Well, typically, nothing. The forest reclaims that land rather quickly. In some areas, I run the rototiller over the ash pile to incorporate the ash into the soil. Wood ash is actually beneficial, maybe not in the concentration that I am making, but it is what it is. Now this pile, that didnt burn completely, I'm not sure yet. As of this morning, the ashes where still smoldering and there are several large burned logs to deal with. I got a feeling that I'll have to get out the saw and get a bit dirty. What makes me more nervous is the last pile.
The last pile which is probably twice as big as the one I burned yesterday, is full of the same 'stuff.' Only the pile is pushed up against some large doug firs and near the county road. It is the pile that the loggers used to load out the trucks with. I'm not worried about the trees so much as I am about the road and the huge logs left behind. If it burns slow, like this last pile, instead of like the first or second one (that was gone within a few hours in a massive flame), that would be best.
I have struggled with the idea of getting a wood
chipper to chip the material. I can use the chips after all. However, I cannot afford a
chipper that will be able to handle large logs. And deconstructing this pile... yikes. I'm not lazy, but that would be a massive job. Interlocking large brush pile with large material in it.
I still dont know what to do.
Here is a photo of the pile I started yesterday, just as I got it going.

You can see, its a jumbled mess.