CLEVELAND, Ohio — A new freighter is sailing the Great Lakes and carrying cargo in and out of the Cuyahoga River. The Mark W. Barker, a 639-foot bulk carrier, is the 10th ship in the Interlake Steamship Co.’s fleet, a Great Lakes carrier headquartered in Middleburg Heights. It’s the company’s first newly built ship since 1981. The MWB arrived in Cleveland this week after embarking from Sturgeon Bay, Wisconsin, where it was built by Fincantieri Bay Shipbuilding. It’s already made eight deliveries.