This bill designates the Elk River Trail in Headwaters Forest Reserve, California, as the Senator Dianne Feinstein Memorial Trail in honor of the late senator. The bill is straightforward legislation that renames an existing hiking trail and updates all federal references to reflect the new name. The change affects visitors and officials who use maps, regulations, and other government documents related to the forest reserve. There is no funding or timeline specified in the legislation, as the bill simply requires administrative changes to official records and designations.