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Diagram of new system of laterally restricted channels used in upper Columbia River.

The construction of Grand Coulee Dam which created Roosevelt Lake, extending almost two-hundred miles from Mason City, Oregon to the Canadian Border, also placed additional work on the Aide to Navigation Section. The Law Officer in March, 1944, advised that Roosevelt Lake was navigable; and after an investigation the Aids to Navigation Officer installed 27 lights and 10 reflectors in those waters. The aids are serviced at the Seattle Operating Base twice a year, and the Bureau of Reclamation offered the use of one of its boats for establishing and maintaining these aids.

ANRAC ??? EQUIPMENT

The enforcement of blackout in the United States at the outbreak of the war made it necessary to extinguish or silence the navigational aids in the continental waters in addition to the blackout of municipal lights. To perform this action by manual

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