Walnut Canyon Study Act of 2009 - Directs the Secretary of the Interior and the Secretary of Agriculture to conduct a study of an area identified as the Walnut Canyon Proposed Study Area (the study area) to assess and report to specified congressional committees on: (1) the suitability and feasibility of designating all or part of the study area as an addition to Walnut Canyon National Monument in Arizona; and (2) continued management of the study area by the Forest Service, or any other designation or management option that would provide for protection of resources within the study area and continued access to, and use of, the study area by the public.