Is there a requirement for periodic updates to a comprehensive river management plan (CRMP) for a river designated by Congress?

No, there is no statutory requirement that a CRMP be revisited in a specified timeframe. However, the federal wild and scenic river-administrator should periodically review monitoring information to determine if there is a need for change in existing direction to ensure values are protected and enhanced. Agency unit-wide plans that are revised following a CRMP-specific plan amendment will follow individual agency practices for plan revision. In some cases, this may include updating the CRMP during the agency unit-plan revision cycle.