Navigating the Portage

Evening Gents, been away from the area for a number of years but am excited to be back around Erie and looking forward to fishing her again. We’ll be coming up the Portage from a mile or two south of Route 2 bridge.. I hear a lot of horror stories about depth or debris problems, especially early in the season. I’m running with 20” draft if it helps. Would appreciate any insights about getting to the open water- is it navigable? Do I run risk of bottoming out? Also, if anyone has any info on the train drawbridge, thanks for that too. Tight Lines!