MARQUETTE — The Lee A. Tregurtha is expected at 1 a.m. Sunday at the Lake Superior & Ishpeming ore dock in Marquette’s Upper Harbor. The Ashtabula is due at 10 a.m. Monday, followed by the Michipicoten at 11 a.m. Monday. The Honorable James L. Oberstar is expected at noon Tuesday. The Michipicoten is due at 5 p.m. Tuesday, followed by the Kaye E. Barker at 8 p.m. Tuesday.