Location: Presque Isle, MI - LS&I Dock
The Lake Superior & Ishpeming railroad built a concrete iron ore dock at Presque at the beginning of the 1900's. The dock is still in use today, shipping taconite pellets from the iron range near Palmer and Negaunee to Cleveland and other points southeast of Detroit.
Ore Dock.The LS&I ore dock was built in 1912 and replaced a timber dock which was built nearby in 1896. The reinforced concrete dock was designed by J. F. Jackson, vice president of the Wisconsin Bridge and Iron Company of Milwaukee. His firm elected the steel superstructure while the reinforced concrete substructure, designed by R. C. Young, the chief engineer of the LS&I railroad was built by the Raymond Concdrete Pile Company. At the time, this was the second reinforced concrete dock built in the United States, completed a year after a similar dock by the Great Northern railway at Superior, Wisconsin.
Overall, it is 1,200' long, 54' wide and 75' above the water. There are 200 ore pockets of 250 ton capacity yielding a total storage capacity of 50,000 tons. Each pocket hass a 12' center and is equipped with a pair of doors, each 5' tall and 3' 8" wide, opening into a steel chute 35' long and weighing 8,200 lbs. The chutes utilized a novel design intended to prevent the ore from sticking to the chute or overflowing its confines. They were designed with curved bottoms and were tapered from 8' 6" wide at the upper end to 4' 6" at the lower end, which was inserted into the bulk ore carrier. [UPM]
Approach. The approach to the ore dock was designed by the railroad's chief engineer, R. C. Young with virtually all work carried out by railroad employees. It consists of an earth embankment one mile long with a 1.5% grade, connected to the dock by a steel trestle 600' long and 70' in height. The base of the embankment was constructed by the Zenith Dredge Company of Duluth, using the material dredged from the harbor to form the slips for the dock. The base utilized approximately 109,000 cubic yards of hydraulically-filled dredglings. Work on the embankment proper began on April 3, 1911 and was completed on January 15, 1912. Crews moved a total of 503,000 cubic yards of sand from a pit one and one-half miles away using trains of 25 side-dump cars. ]UPM]