A bypass channel (C) for fish extends along line one side of a river, for the
full
length of a section of the river in which reservoirs (22, 24, 26, 28) have
been created by dams (14, 16, 18, 20). The channel (C) follows the grade
of the natural river. It includes an inner wall (34) that varies in height
so that it is always higher than the water level in any of the reservoirs. It also
includes an outer wall (36) and a bottom wall (38) which are formed
on the natural terrain that borders the river and reservoirs. In at least its taller
regions, the inner wall (38) may be braced by a diagonal member or a system
of member (40). Water flow into the channel (C) maybe regulated by horizontal
and/or vertical gates (50, 52) or some other structure for changing the
cross sectional area of the channel (C).