Is the site eligible for listing on the National Register of Historic Places?
Properties already listed on the National Register are, of course, “eligible.” Properties not yet listed are considered eligible if they meet the following criteria: • Age – 50 years old or older • Research potential – Sites can yield important information about prehistory or history. If the site is 50 years old or older and has integrity, the determination would be “Eligible Historic Property.” If there are no historic properties in the project area, or if the site is less than 50 years old, or if the site lacks integrity, the determination would be “No Historic Properties.” EFFECT: What impact will the work will have on the site? Effect needs to be determined only for eligible properties. There are three possible effects: • No Effect – Only minor changes are being proposed, e.g., planning or minor construction. • No Adverse Effect – More substantial changes are proposed, but they meet Secretary of the Interior Standards. • Adverse Effect – Work is proposed that will damage or diminis
