What if one is not sure whether a particular river area should be evaluated pursuant to Section 5(d)(1) for possible eligibility determination?

It is important to develop and apply standardized criteria through a documented evaluation process that may include a screening for potential wild and scenic rivers. If there doubt, evaluate the river according to the criteria in the Wild & Scenic Rivers Act, i.e., free-flowing condition and outstandingly remarkable values.

Source
Interagency Wild & Scenic Rivers Council