I got the poles used, they came from the harbor in NYC, they were over 100' long. I was able to salvage 80'.
There are parts of our river that have 10000 years of goose chit, 100' poles just disappear in the muck. Wasn't sure what I was going to have here so I planned for the worst. They got 6' down and hit the hard pan then just drove them the rest of the way.