571—40.21 (462A) Zoning of the Des Moines River. Vessel operation on the Des Moines River from its confluence with the Mississippi River in Lee County to the northerly meander lines of both the East and West Branches, shall be governed by this departmental rule as well as all applicable state laws and regulations.
	 40.21(1) No vessel, except authorized emergency vessels, shall be operated in marked areas at a speed greater than the limit designated by buoys marking said areas.
	 40.21(2) No vessel, except authorized emergency vessels, shall be permitted in areas specifically designated for swimming and wading which are plainly marked by the use of buoys.