What is the time period for developing a comprehensive river management plan (CRMP) for a river designated by Congress?

The CRMP for rivers designated on or after January 1, 1986, is to be completed within three full-fiscal years after the date of designation or as otherwise specified, with a notice of completion and availability published in the Federal Register. For rivers designated before this date, Section 3(d)(2) requires review of the CRMP to determine if it conforms to Section 3(d)(1). This provision allowed ten years to update pre-1986 plans through the planning processes of river-administering agencies. Note: This 10-year period expired January 1, 1996.

Source
Interagency Wild & Scenic Rivers Council