Last August Raina Clark began the story of her eight day trip on the Mississippi and Illinois Rivers on the towboats Theresa Wood and Thomas E. Erickson, both chartered by AEP River Operations and owned and by Marquette Transportation. She described the working lives of the crew, how the relationship between the boats and the lock facilities has changed since 9/11, a river boat captain who built his crew into a tightly knit team and the uniqueness of the Upper Mississippi. In this third and final installment…