At times six cranes grace the downtown skyline in Sioux Falls. Cranes are located at the 10-story Cherapa project along the Big Sioux River. Nearby is the nine-story Steel District at the former site of Sioux Steel. It is adjacent to the southend of Falls Park and is along the Big Sioux River. Falls Park is 128 acres and the river has a drop of 100 feet in the park. A new addition to the park…