Sort of looks like an alanthus. Need to see some leaves. I have a terrible time IDing trees around here in the winter.
Good luck on the bid. 260 trees sounds like a nice end of winter project.
It does kind of look like an alanthus and a Kentucky coffee tree but it's too light of a color to be a Kentucky coffee tree (at least in my state) and it isn't nearly smooth enough bark to be an alanthus. This tree is an Amur Corktree (phellodendron amurense). The bark feels like cork when you touch it. I guessed that it had to be a super soft wood. The arboretum guys said they lost two more of them and some woodturners asked them to save a few pieces for them. The wood was cracked so badly by the next day that it wasn't usable for turning.
As far as the tree job.....they already moved most of the downed trees into large piles but they can't find anyone to chip it all. I went down there yesterday with the idea that our company would do it for free as a donation to the arboretum. But I told them that they really need to just get a tub grinder in there (I'd burn it all but they don't want to for some reason). They have massive piles of brush mixed in and pushed together with logs, mature tree trunks, etc. We aren't untangling all of that. It would take forever. But they do have a separate trail system which is still closed and they asked me to give them a bid to get it safe to reopen as they are expecting hikers to start getting out there this month. I walked all of the trails today and parts of them are just wrecked. I told them we can get it all ready to open in 5-7 days (depending on how far they want us to go) and I can rearrange some things and have a 3 man crew there on Monday. Sounds like we might get that job. I'll post a bunch of pics of the damaged trees if we do.