The Rosgen method is a more detailed way to classify streams than the Strahler method. It is often used by state and federal agencies. It is also known as the channel shape method. This approach categorizes streams into types A-G on the basis of
In addition to the letter (A-G) it is given for classification, the stream/river can also be followed by numbers 1-6 which relates to the stream bed material type. They are classified as follow:
1 – Bedrock
2 – Boulders
3 – Cobble
4 – Gravel
5 – Sand
6 - Silt-Clay
The Rosgen Method is useful because it can provide hints about what type of management activities may be best suited for a given stream.
The basic tenant of the Rosgen classification approach is as follows:
Further information is provided on the following Rosgen Stream Types:
Montana Stream Management Guide for Landowners, Managers, and Stream Users. 1998. Montana Dept. of Environmental Quality. 34 pp.
Rosgen, D. L. (1994). A classification of natural rivers. Catena, 22, 169-199.
Rosgen, D.L. and H.L. Silvey. 1996. Applied River Morphology. Wildland Hydrology Books, Fort Collins, CO.
Surber, Gene and Bob Ehrhart. 1998. Stream and Riparian Area Management. Montana State University Cooperative Extension Service.
United States Environmental Protection Agency. 2008. Fundamentals of the Rosgen Stream Classification System. USDA EPA Watershed Academy. http://www.epa.gov/watertrain/stream_class/index.htm Accessed on 17 May 2010.
Ward, A., J. L. D’Ambrosio, and D. Mecklenburg. 2008. Stream Classification. The Ohio State University Extension. Agriculture and Natural Resources Fact Sheet AEX-445-01.
Reprinted from: Rosgen, Dave. 1996. Applied River Morphology. Page 5-5, image 5-2, with permission granted from Darcie Frantila, Wildland Hydrology, 11210 North County Road 19, Fort Collins, CO 80524. http://wildlandhydrology.com