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"TAE MarRINE REVIEW 35. Perit ds ee we ELECTRIC CRANE tries, affording both markets for local products and bringing nearer to hand those products of farm and mine and factory which are now reached only by 'rail, 1) at all. "But, above all a more reliable and complete exchange of commodities with the vast Missis- sippi:valley will be realized, and through it with .the Gulf 'and the world-wide inter-oceanic' trade,' the fulfillment of which will reach its con- summation in the completion of the Ishmian canal, whose construction is now happily progressing so satisfact- orily, Reverting to the work already ac- complished on the Ohio it is worthy of special note that for nearly a quar- ter of a century the dam at Davis island has been doing service for the interests in the Pittsburg harbor. So EQUIPMENT FOR CONSTRUCTION OF NO. 5, MONONGAHELA RIVER, Recreate cd : : a Vai ee css ae Os NEW LOCK long indeed has the magnificent work of this one improvement continued that we have almost ceased to regard its real worth, and apparently have come to the "erroneous. conclusion that it does not amount te much and. after all conditions would not differ widely were this dam not in existence,> Anmncally as-,soon as the spring freshets have subsided and the natural stage of water reaches about . 6 it. at Davis island. lock the: dam is raised and the level of the water rises 12 ft. above the sill of the dam, producing a 6-ft. stage in the Pitts- bure harbor. And this process is re- peated after each considerable rise of the river so 'as to. maintain a least navigable depth above the dam or not less. than: 9. ft. So accus- tomed have we bezome to observing ' SPOR ee it ton Sate es Soe lg mee UG Saag Crogan DAM NO. 4, OHIO RIVER, NAVIGABLE PASS FOUNDATION AND PRO- TECTION CRIB UNDER CONSTRUCTION. a good navigable stage in the harbor, sufficient for the movement of vessels: of every kind and draught peculiar to this locality at all times, that 'many forget that without Davis island dam the river at Pittsburg would go al- most dry and remain. so for long periods at a time nearly every seas- on. Take the present season as an ex- ample. True it has been one of ex- ceptional drought during the past four months.~ Up fo the first' a. August, however, it was simply a normal summer. Davis island dam was raised immediately upon the de- ¢line of the spring rises, which was: somewhat later than usual this year, © namely on June 10. Since that date there has not been a moment that' the conditions for navigation of any DAM NO. 2, OHIO RIVER, VIEW FROM ABOVE: HERR ISLAND DAM NO. 1; ALLEGHENY RIVER, SHOWING TWO 94-FT. STEEL-BEAR TRAP GATES IN FOREGROUND AND CHANOINE ° hio. Rwer, Lock eg tes WICKET NAVIGABLE PASS BEYOND; ** **° °*~~'"*