How is a comprehensive river management plan (CRMP) developed for a river designated by Congress with adjoining segments administered by two or more federal managers?

Ideally one coordinated CRMP is developed with each wild and scenic river-administering agency documenting its respective decisions. In a few cases, separate plans may be required. However, even in this case, the planning process is conducted jointly to the greatest extent possible to ensure consistency of outstandingly remarkable values, classification, standards, and monitoring.

Source
Interagency Wild & Scenic Rivers Council