MARQUETTE — The American Spirit is expected at 4 a.m. today at the Lake Superior & Ishpeming ore dock in Marquette’s Upper Harbor. Due at 2 p.m. today is the Herbert C. Jackson. The Honorable James L. Oberstar is expected at 6 a.m. Wednesday. The Lee A. Tregurtha is due at 6 p.m. Friday. On Saturday, the Maumee is due at 4 a.m.