_William Crow._
* * *
The engineers report that the greater part of the material carried in
suspension in the Hudson river above Albany is believed to come from
the Mohawk river, and its tributary the Schoharie river, while the
sands and gravel that form the heavy and obstinate bars near Albany
and chiefly between Albany and Troy, come from the upper Hudson.
The discharge of the Hudson between Troy and Albany at its lowest
stage may be taken at about 3,000 cubic feet per second. The river
supply, therefore, during that stage is inadequate in the upper part
of the river for navigation, independent of tidal flow.
The greatest number of bars is between Albany and Troy, where the
channel is narrow, and at least six obstructing bars, composed of fine
and coarse gravel and coarse and fine sand, are in existence. In many
places between Albany and Troy the navigable depth is reduced to 71/2
feet by the presence of these bars.
From Albany to New Baltimore the depths are variable, the prevailing
depth being 10 feet and over, with pools of greater depth separated by
long cross-over bars, over which the greatest depth does not exceed
9 or 10 feet.
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