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Third Lock at Sault A Great Addition to the Navigation Facilities of the Great Lakes Goes Into Commission HE new third lock and separate canal on the American side at Sault Ste. Marie was opened to commerce on Oct. 2lst. There were no ceremonies whatever, but owing to the importance of the event to lake navi- gation interests, a delegation of vessel owners attended the opening. The new lock, known as the Davis lock, is 1350 feet long between gates, giving a usable Jenath of ..not less. than. 1300. feet wth a width of 80 feet and a least depth of 24% feet over the sill. The increased depth available through the new _ lock will obviate the restriction heretofore im- posed on the American side by the limit- ed depth of about 18% feet at mean low water stages through the Poe lock and will enable vessels to pass through the St. Mary's river with a draught of 21 feet at low water, conforming to the least depth of the improved channels. The separate canal has a width of 260 feet to 300 feet: The first appropriation for the work was made in 1907 and a cofferdam sur- rounding the site was completed in 1909 when a contract was let for the excava- tion which required two years to com- plete. The masonry was built in 1912 and 1913 and the machinery and gates were completed during the present year. There are two pairs of operating gates at each end of the lock to guard against accident, making the total length of the masonry 1750 feet. The side walls are 50 feet high above the floor; those at the ends forming the gate abutments are 36 feet thick and the side walls in the chambers are 26 feet thick at the base and 12 feet at the top. Under the 2-foot floor are six 9 x 10-foot culverts, ageregating 7,000 feet in length, separ- ated by 4-foot reinforced concrete parti- tion walls. Anchoring the culverts down are two rows of 1%-inch fox bolts 20 feet long and 4 feet apart, let into the locks 7 feet and extended upward into the partition walls. In addition a row of l-inch bulb bars 5 feet apart anchors the culverts on the center line. The walls of the lock rest on a Pots- dam sandstone foungation and the stone used in making the concrete was ob- tained from the Bruce limestone quarries on the St. Mary's river 40 miles away. , It was dumped into 22 feet of water and reclaimed by a whirler derrick operat- ing a 2-yard Williams bucket dumping its load directly into' Allis-Chalmers crushers as needed. The concrete was mixed in the proportion of 1 part Uni- versal Portland cement to three parts sand and five parts broken stone. The Great Lakes Dredge & Dock Co. had the contract for this work. The walls took an aggregate volume of 1060 cubic yards per linear foot. The forms for the walls were of sheet steel 39 feet in length held in place by a mounted struc- tural steel frame made up of four angle trusses, designed to withstand the pres- sures set up by the successive deposits of 40 cubic yards of concrete per linear foot. The concrete was designed to exert a hydrostatic pressure for a height of 10 feet and weigh 100 pounds per cubic foot. For maximum stresses a. bE, MASONRY OF THIRD LOCK. GENERAL VIEW LOOKING WEST ON NOV. =6;1913 '