This term refers rather to the bed in which the main stream of a river flows than to the deep water of the stream as followed in navigation. Bridge Co. v. Dubuque County, 55 Iowa, 55S, 8 N. W. 443. See The Oliver (D. C.) 22 Fed. 849; Iowa v. Illinois, 147 U. S. 1, 13 Sup. Ct. 239, 37 L. Ed. 55; Cessill v. State, 40 Ark. 504. The “main channel” of a river is that bed of .he river over which the principal volume of ivater flows. Many great rivers discharge themselves into the sea through more than one channel. They all, however, have a main channel, through which the principal volume of water passes. Packet Co. v. Bridge Co. (C. C.) 31 Fed. Rep. 757