How far down does that jam go (depth into the river)? How much are you expected to remove - just the logs, or the built up sandbar?
I realize that this thread is an attempt to mitigate the following, but
this guy got mocked mercilessly for this speech but he had a really good point:
I'm still in the camp of "this is too big a job". Removing the logs on top of the sandbars removes the unsightly mess, but it's the tip of the iceberg and next year it's going to start piling up again. Sure, the logs on top catch other logs that much more easily, but you're talking a very short term "solution", and the solution is only a solution to the immediately visible problem and not the root.
Definitely seems like the liability is on the bridge; if I was the rich museum, I'd sue the RR company to make them take care of their bridge and ensure they understand the huge liability they have.
Meanwhile, if you insist on taking the job, perhaps there's some US Army floating bridge kind of thing that's available ... somewhere... (
link)?
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in the "drought months" shouldn't be a problem to set that across the river, and you could get a decent excavator on it.