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to be not less than 36 feet wide. There are two principal channels in the river, and at each there is to be draw which Will admit the passage of the largest vessels navigating the Potomac above the bridge. At Unsuitable distance from the draws, and on both sides of each, there Is b be an arch, under which an ordinary steam boat may pass. .i'i,c draw at the eastern channel is not to ba less than 5 feet, that at the western not less than 5ti. All practical atten- ton is to be given in the construction to preserving the navigation. A pre- mium of $$2oo will be paid for an apr proved design.

 Tine eastern channel is 22a32 yds. wide. the western 450; the depth of water , feet in the former, 2S in the latter, at low water. The greatest rise of tide is about six feet. or the l050 yards be- tween the two channels, 750 have depth at low water of only B. The middle channel is 300 yards wide, and has but ' feet water.