571—40.10 (462A) Mississippi River lock and dam safety zone. A safety zone is hereby established in Iowa waters above and below all navigation lock and dam structures on the Mississippi River between the Iowa-Minnesota border and the Iowa-Missouri border. The established zone shall be 600 feet upstream and 150 feet downstream from the roller gate or tainter gate section of the structure.
	 40.10(1) The safety zone does not include the area directly above and below the navigation lock structure.
	 40.10(2) The safety zone does not include the area directly above and below the solid fill portion of the dam and structure.
	 40.10(3) The safety zone shall be recognized by the state of Iowa only when plainly marked as follows:
	  a.   	 Upstream signs worded—Restricted area keep 600 feet from dam.
	  b.   	 Downstream signs worded—Restricted area keep 150 feet from dam.
	  c.   	 Flashing red lights will be used to make the outer limits of the restricted areas.
	 40.10(4) No boat or vessel of any type, except authorized vessels, shall enter the established safety zones recognized by the state of Iowa as described in this rule.