19.6’,limited by a bridge outside Chicago. Several routes require a maximum 15’ height and others are 17’. https://www.greatloop.org/great-loop-information/grea

19.6’,limited by a bridge outside Chicago. Several routes require a maximum 15’ height and others are 17’. https://www.greatloop.org/great-loop-information/great-loop-faqs.html#FAQs%20about%20GL%20Boats https://www.greatloop.org/great-loop-information/great-loop-... I’ve been utterly fascinated by this since I learned about it a few months ago. It seems like a very approachable but still serious adventure and achievement once done.