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in its completion and opening for use of the public in 1885. It marked a great advance in artificial navigation in this locality, furnishing an excellent harbor during the usually low wa- ter intervals of summer and fall, and at the same time presenting no ob- struction to the free use of the open river in rises sufficient for the trans- "TAE. MarRIne. REVIEW occasion the late Senator M. S. Quay secured an appropriation for the con- struction of a second movable dam three miles below Beaver, Pa. now designated as dam 6 of the Ohio river. series. Qn this structure work was commenced in 1892, and it was completed and put in operation nearly five years ago. Being a somewhat 33 and 5, located respectively at Glen- field, Glenosborne, Legionville and Freedom. In 1906 No. 2 was placed in commission; No. 5 followed in the fall of 1907, and in July, 1908, 3 and 4 were put in operation, completing a series of six movable dams at the head of the Ohio, and together with Herr island dam, in the Allegheny, DAM NO. 5 OHIO RIVER, PILES FOR CONCRETE BEAR' TRAP GATES, FOUNDATION OF DAM NO. 6, OHIO RIVER, SHOWING ONE 120-FT. BEAR TRAP GATE UP AND THE. OLMER (PARPEY, Wp: DAM NO. 4, OHIO RIVER, SHOWING CHANOINE WICKETS IN RAISED POSITION, FOUNDATION, PROTECTION CRIB BELOW DAM, COFFERDAM ENCLOSURE. ALL WITHIN portation of coal and other. heavy bulk freight. It was then. apparent that of necessity some must elapse ere the full fruits of this grand innovation were to be realized, and it was not until 1890 that the next step was taken in what will ultimately culminate in a continuous perma nent pool navigation over the entire length of the Ohio river. On that time isolated structure it cou!d be of small value except to-form a harbor at the mouth of the Beaver river. However, it furnished an.argument for further appropriations for building the inter- mediate. dams. between it and dam. 1, at Davis island, which was readily accomplished as a single © project. About 1898 active construction op- erations were started on dams 2, 3, 4 LOCK NO. 1, MONONGAHELA RIVER, LEFT 1840 AND STILL SERVICEABLE AND ,IN OPERATION CONSTANTLY. THE LOCK Is'SHOWN IN i THE BACKGROUND OF THIS PICTURE. Manon Fiver Look No. ph HAND LOCK BUILT IN making an initial series of seven large movable dams in consecutive order in this vast industrial center. Thus during the past year new lock and dam 3 on the Monongahela and locks and dams 2 and 3, on the Alle- gheny, have been added to the navi- gation structures in operation in this district, and all of the Ohio river locks and dams, down to and includ-