9c1b3464_WQP_User_Guide__Definition
[Site Type] Lake, Reservoir, Impoundment [Definition] 
An inland body of standing fresh or saline water that is generally too deep to permit submerged aquatic vegetation to take root across the entire body (cf: wetland). This site type includes an expanded part of a river, a reservoir behind a dam, and a natural or excavated depression containing a water body without surface-water inlet and/or outlet.
WQP User Guide
Definition