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"TAE MARINE. REVIEW 31 NEW LOCK NO. 2 MONONGAHELA RIVER, PILES DRIVEN FOR FOUN- DATION. and the extensive' repair of some others. Accordingly locks and dams 2 and 3 have already been rebuilt, and the construction of new No. 5, at Brownsville, is now also well under way. With dam No. J, at' Pittsburg, and the smaller lock at No. 4 recon- structed the needs of the Mononga- hela river for many years will appar- ently have been pretty well met. Prior to 1879 the Allegheny river, although transporting a considerable commerce, seems to have been entirely neglected by the federal government. At that time, however, through the efforts of some persons specially in- terested in its improvement, congress was prevailed upon to make a small appropriation for the removal of vast deposits of dangerous boulders along GROOVE its course and the construction of de- flecting dikes and low dams closing duplicate chutes at heads of islands and bars. This was followed by sim- ilar small appropriations for continu- ing such work, until in 1885 when, congress becoming convinced of the importance of the stream, determined upon its radical improvement and pro- vided a small sum for the construc- tion of a lock and dam in the vicinity of Herr island, now commonly known as Herr island dam. Considerable de- lay marked the early history of this structure, partly owing to the mea- gerness of appropriations and partly because of the general opposition to a fixed dam at that greatly contract- ed portion of the river located with- in the limits of the cities of Pitts- NEW DAM NO. 2 MONONGAHELA RIVER, NEARING ,COMPLETION, ON TOP FOR CHITTENDEN DRUMS. burg and Allegheny' where the banks were comparatively low. -- Finally, in 1893, the dam,.at the. solicitation of the municipalities and manufacturers and others located near its site, hav- ing been changed to a movable one, similar to Davis island dam, and ap- propriations having accumulated to an amount justifying a commencement, was placed under construction, Its completion and initial operation oc- curred in January, 1903, since which time its mantenance and maneuvers have been altogether satisfactory. Following this improvement provision was made: for the erection of dams 2 and 3, fespectively, at Aspinwall and Springdale. .No. 3 was first put in operation in the. fall of 1904, but in January, 1906, the dam had to be yer Py ee aed mie Nw eT an ae fo ata x' Fats Sle Ba) Sd "8 = Ps a se an PILE FOUNDATION FOR NEW DAM NO. 2: MONONGAHELA RIVER. od 4 a NoAZ 2. Monon. River Lock No.2. US Engineer Office, Pittsburg, Pe. NEW LOCK NO. Zs MONONGAHELA RIVER, SHOWING MONOLITHIC CONSTRUCTION OF CONCRETE LOCK WALLS.