Nothing in this subchapter shall be construed as affecting in any way any rights of owners and operators of cattle and sheep herds, existing on the date immediately prior to November 12, 1971, to trail their herds on traditional courses used by them prior to November 12, 1971, and to water their stock, notwithstanding the fact that the lands involving such trails and watering are situated within the park: Provided, That the Secretary may designate driveways and promulgate reasonable regulations providing for the use of such driveways.

There are hereby authorized to be appropriated such sums as may be necessary to carry out the purposes of this subchapter, not to exceed, however, $275,000 for the acquisition of lands and interests in lands and not to exceed $1,031,800 (April 1970 prices) for development, plus or minus such amounts, if any, as may be justified by reason of ordinary fluctuations in construction costs as indicated by engineering cost indices applicable to the types of construction involved herein. The sums authorized in this section shall be available for acquisition and development undertaken subsequent to November 12, 1971.