(a) Shasta; Clair Engle-Lewiston
When the Secretary of Agriculture determines that sufficient lands, waters, or interest therein are owned or have been acquired by the United States within the boundaries of the Shasta unit or within the boundaries of the Clair Engle-Lewiston unit to permit efficient initial development and administration for the purposes of this subchapter, he shall publish in the Federal Register a notice to that effect and a detailed description of the boundaries of such unit.

(b) Whiskeytown
When the Secretary of the Interior determines that sufficient lands, waters, or interest therein are owned or have been acquired by the United States within the boundaries of the Whiskeytown unit to permit efficient initial development and administration for the purposes of this subchapter, he shall publish in the Federal Register a notice to that effect and a detailed description of the boundaries of the unit.

(c) Acquisition of property
Following the publication of any such notice, the respective Secretaries may continue to acquire the remaining property within the recreation area.