The PR&G govern how federal agencies evaluate proposed water resource development projects. They provide direction to federal agencies when evaluating and selecting major water projects. As it relates to the St. Mary Canal Modernization Project, in addition to complying with the requirements of National Environmental Policy Act (NEPA), the Plan-EIS must also meet PR&G requirements. More information on how the PR&G will be incorporated into the Plan-EIS process can be found in the U.S. Department of Agriculture’s Guidance for Conducting Analyses Under the Principles, Requirements, and Guidelines for Water and Land Related Resources Implementation Studies and Federal Water Resource Investments DM 9500-0013.