Analysis of reference reach data and the prediction of stream types

Measurement and analysis of reference data that describes stream reaches an d their associated valleys is a valuable tool for the land manager. Valley bottom characteristics and stream types are closely related. By knowing wha t stream type can be expected for a given valley bottom width and gradient, Desired Future Condition can be defined and Existing Condition assessed. T he Rosgen classification provides one vehicle for making these determinatio ns. Measured field data on the Beaverhead-Deerelodge National Forest showed that differences in actual conditions consistently reflected what would be expected based on the classification.