Freshwater river or stream
Freshwater river or stream means a lotic (free-flowing) system that does not receive significant inflows of water from oceans or bays due to tidal action. For the purposes of this rule, a flow-through reservoir with a retention time of 7 days or less will be considered a freshwater river or stream.
Source
40 CFR § 125.83
Scoping language
The following special definitions apply to this subpart: