OK Sean thanks for the context. If you are not getting paid for drive time i do not envy you that contract.
"Having a full day to prune one large tree would be great."
Having a week would be great too, but that still looks like 2-3 hours, including cleanup aka brush piles for habitat/cwd.
"As far as failing-
I don't feel at liberty to discuss the inner workings, though I will say that the large basal wounding (approx. 1/4 of circumference or so), and proximity to immovable "targets" (bridge, roadway, walkway) is one red flag."
So the govt keeps the TRA process secret? If i was a taxpayer there i'd be curious. as for the basal wound, that may increase the risk of it falling into the river much more than any other direction, right?
" This tree did drop a large limb off the "lean side" over/ near a closed campsite."
Branches getting overextended toward openings is natural and foreseeable and preventable without too much work; see above. Your supervisors hopefully will consider this type of work being done in the future as regular maintenance.
"It showed some decay in the upper crown limbs, but most of it collapsed on impact, and we didn't have time to look into the whole tree too much that day. Treated as an individual tree, other things could have been done here, however in the overall context of our situation, it is what it is."
I totally understand, and am not going to war over an old damaged cottonwood. It's just that the risk factors seemed hastily described at first and potentially overstated; that's all. Sounds like rewarding work and i hope the contract works out well for you guys.