About: Rosgen Stream Classification

The Rosgen Stream Classification is a system for natural rivers in which morphological arrangements of stream characteristics are organized into relatively homogeneous stream types. This is a widely-used method for classifying streams and rivers based on common patterns of channel morphology. The specific objectives of this stream classification system are as follows: 1) predict a rivers behavior from its appearance; 2) develop specific hydrologic and sediment relationships for a given stream type and its state; 3) provide mechanisms to extrapolate site-specific data to stream reaches having similar characteristics; and 4) provide a consistent frame of reference for communicating stream morphology and condition among a variety of disciplines and interested parties. These objectives are met