What century were the Leiper Canal and Duluth Ship Canal built?
Leiper Canal Early in the 19th century, the Leiper Canal built in 1828-29 during the middle of the American canal age ran about 3 mi along Crum Creek in Delaware County to its mouth in Eastern Pennsylvania's Delaware Valley carrying its owners quarried products to docks on the Delaware River tidewater until 1852.
Jay Cooke State Park Jay Cooke State Park is a state park of Minnesota, United States, protecting the lower reaches of the St. Louis River. The park is located about 10 mi southwest of Duluth and is one of the ten most visited state parks in Minnesota. The western half of the park contains part of a rocky, 13 mi gorge. This was a major barrier to Native Americans and early Europeans traveling by canoe, which they bypassed with the challenging Grand Portage of the St. Louis River. The river was a vital link connecting the Mississippi waterways to the west with the Great Lakes to the east.