Sierra Nevada Forests Ecosystem Study Act of 1992

Sierra Nevada Forests Ecosystem Study Act of 1992 - Directs the Secretaries of Agriculture and of the Interior, within three months of enactment of this Act, to establish a Sierra Nevada Forests Scientific Committee (Committee).

Requires the Committee to submit by December 31, 1994, a draft report to the Secretaries and the appropriate congressional committees that shall include: (1) a delineation of the various Sierra Nevada Forests ecosystems; (2) an inventory of each ecosystem's lands and resources; (3) an evaluation of each ecosystem's health conditions and trends and identification of affecting processes, activities, and other factors such as drought, fire, timber harvesting, and residential development; (4) recommendations for alternative management strategies; and (5) recommendations for Sequoia ecosystem management. Requires: (1) a final report to be submitted by March 31, 1995; and (2) each report to be submitted to the National Academy of Sciences for peer review before submission to the Congress.

Directs the Secretary of Agriculture to manage the Sierra Nevada Forests until December 31, 1996. Provides that during such interim period: (1) new roads and aerial or cable logging shall be prohibited in roadless areas (logging in areas accessible from existing roads shall be permitted); (2) no management practices shall be permitted that would adversely affect water conditions or fish habitats, including logging within specified distances of permanent and seasonally flowing streams; (3) timber sales prepared as agreed to in the Mediated Settlement Agreement for the Sequoia National Forest or under contract as of September 30, 1992, in specified national forests shall be permitted; and (4) Sierra Forest ecosystem restoration projects may be undertaken subject to Committee approval.

Authorizes appropriations.