Section 162.230 - Columbia River, Wash(a)Grand Coulee Dam discharge channel; restricted area -(1)The area. That portion of the Columbia River between Grand Coulee Dam (situated at river mile 596.6) and river mile 593.7.(2)The regulations.(i) No vessel shall enter or navigate within the area without permission from the enforcing agency.(ii) The regulation in this section shall be enforced by the Chief, Power Field Division, Columbia Basin Project, U.S. Department of the Interior, Coulee Dam, Washington.