Is a comprehensive river management plan (CRMP) ever developed during the study?

Yes. In some river study authorizations Congress has required the study agency to work with state and local governments and the public to develop a CRMP in concert with the study process to assist in determination of the river’s suitability. Such pre-designation CRMPs have, in some cases, been adopted in the legislation adding the river to the National Wild & Scenic Rivers System. In cases where Congress has not authorized a pre-designation CRMP, agencies have taken the initiative to develop elements of the CRMP in the study report (pre-designation).

Source
Interagency Wild & Scenic Rivers Council