RCW 47.72.060
"Canal" defined.
For the purposes of this chapter, "canal" is defined as any waterway for navigation created by construction of reservoirs or construction of channels by excavation in dry ground, in streams, rivers or in tidal waters and any existing waterway incorporated into such a canal and including any appurtenant features necessary for operation and maintenance of the canal.
[ 1965 ex.s. c 123 ยง 6. Formerly RCW 91.12.060.]