The "Protected Areas" data set and the "Hydro Site" data set are companions done at the same time.

The "Protected Areas" data set describes areas where hydroelectric development is discouraged to protect other resources.
Information about the Protected Areas is housed here at StreamNet and at the Northwest Power and Conservation Council.

The "Hydro Site" data set describes areas where hydroelectric development is considered more appropriate.
Information about the Hydro Site data set is housed at Bonneville Power Administration.

Some limited information about the Hydro Site database is included here.