Average haul over portion of rivers under improvement, 100 miles; total average haul, rivers and oceans, exports and imports, 8,000 miles; domestic, 800 miles; local river, 70 miles. 6. COLUMBIA RIVER AT THE MOUTH, OREG. AND WASH. During the year the construction of the north jetty and dredging on the bar with the dredge Chinook were continued and surveys of the bar were made. JETTY CONSTRUCTION. The length of the trestle June 30, 1915, was 11,177 feet. During July the trestle was extended 1,223 linear feet to the end, making the total length of trestle 12,400 feet. The cost of the trestle extension was $9.05 per linear foot; total, $11,073.21. The end bent of the trestle was carried away by a storm in December. The total quantity of stone in the jetty on June 30, 1915, was 1,426,405 tons. Total stone placed during the year, 859,737 tons; total quantity of stone in the jetty June 30, 1916, 2,286,142 tons. Of the total quantity of stone, 838,309 tons were purchased under contract and 21,428 tons in open market, at $1 per ton f. o. b. barge, Fort Canby, and placed in the jetty by hired labor with Government plant. The cost of purchasing and placing the rock was $1,154,771.07, or $1.34 per ton. The total of all expenditures on the jetty was $1,165,844.28, or $1.35 for each ton of stone in place. On the basis of a total of 3,000,000 tons in the completed jetty, the cost of the stone placed during the year, including the proper proportion of the cost of preliminary work, was $1.48 per ton. A few minor accidents occurred on the tramway during the year, but no one was injured, and the damage was slight. There were 339 cases of injury to employees on the work during the year; of these 3 were transferred to the post hospital at Fort Stevens, Oreg., the others being treated in the infirmary at Fort Canby. DREDGING. The dredge Chinook worked on the bar from July 1 to November 9, 1915, and either in the estuary or on the bar from May 1 to the end of the year. The dredge was laid up for the winter on November 12 and for repairs and overhauling from March 3 to April 28. From July 1 to August 28 the dredge worked 24 hours a day, with three shifts; from August 30 to October 8, 16 hours a day; from October 11 to November 9, 8 hours a day; from May 1 to the end of the year, 16 hours a day. Between July 1 and November 9 the dredge removed 1,002,065 cubic yards from the bar; between May 1 and the end of the year, 546,585 cubic yards from the bar and 9,610 cubic yards from the estuary channels. For details of work in the estuary see report on Columbia and Lower Willamette Rivers below Portland, Oreg. TABLE 2.-Quantity of material dredged monthly from the bar. The dredge worked in the same area throughout the year. This is the same area in which she worked from April to June, 1915. The dredging range was changed in December, 1915, from the easterly edge of the cut to a mid-channel range, as shown on maps herewith.1 The effect on the bar of the dredging done is referred to below under surveys. SURVEYS. Surveys of the bar were made in September and December, 1915, and in March and June, 1916, at a field cost of $4,341.35. For maps of these surveys, for sand movement on the bar during the year, and for changes in the position of the crest of the bar and of certain contours on the inside and outside of the bar, see maps herewith. The survey of June, 1916, showed the governing depth on the main channel range to be 36 feet as against 28 feet in June, 1915; the gov erning depth on the south channel range was 31 feet, as against 30 feet in June, 1915, and on the north channel range 31 feet, as against 27 feet in June, 1915. APPROPRIATIONS. UNITED STATES FUNDS. Previous projects (see H. Doc. No. 1491, 63d Cong., 3d sess., p. 432). Present project: June 6, 1900_. June 13, 1902. Mar. 3, 1903- Mar. 2, 1907– May 27, 1908_. Mar. 3, 1909 (allotted Apr. 20, 1909). Mar. 4, 1909– June 25, 1910_ Feb. 27, 1911– July 25, 1912. Mar. 4, 1913_. Oct. 2, 1914 (allotted Oct. 7, 1914). Total of appropriations_-_. * $250,000.00 500, 000. 00 *1, 000, 000. 00 400, 000, 00 400, 000. 00 1, 000, 000. 00 1 1 $1,993, 180. 00 13, 850, 244. 00 15, 843, 424. 00 Name of lessee: Columbia River Packers Association, Astoria, Oreg. Date of lease: April 30, 1915. Character: Lease for one year of certain United States land on Sand Island, mouth of Columbia River, Oreg. and Wash. Price: $11,474 per annum. Approved: By Chief of Engineers, May 7, 1915; by Assistant Secretary of War, May 8, 1915. Date of beginning: May 1, 1915. Date of expiration: Automatically expired April 30, 1916. 1 Does not include $50,000 transferred to improvement below Tongue Point (river and harbor act of June 3, 1896). 2 Appropriated for repairs and prosecution of jetty work pending adoption of definite project. Report of Board of Engineers dated Jan. 24, 1903, was adopted by the river and harbor act of Mar. 3, 1905. |