Bulletin 1486, U. S. Dept. of Agriculture 
Plate 3 
Examples of Channel Movement and Control 
A.— The channel of the Willamette River has changed to such an extent that the old swing 
span shown at the right is now over dry land. The channel is still progressing toward 
the left 
B. — Wing dams deflect the current outward but on striking the main body of water the 
current is redeflected inward. For this reason wing dams are frequently not as satis- 
factory as bank riprap unless a series of dams is carried completely past the limits of 
current attack 
