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Stream Function Assessment Method

The Stream Function Assessment Method (SFAM) is used for assessing the functions and values of wadable, non-tidal streams for the purposes of Oregon’s Removal-Fill Law, as well as purposes related to Section 404 of the federal Clean Water Act.

SFAM Components

SFAM User Manual Version 1.1 (PDF)
The SFAM user manual provides an overview of SFAM, background information on development and purpose, and illustrated step-by-step instructions for completing an assessment.

SFAM Scientific Rationale Version 1.1 (PDF)
The SFAM Scientific Rationale provides descriptions of the models, illustration of each measure scoring index, details on the supporting literature, and example scenarios for using SFAM in stream restoration design and predicting change in stream functions.  The Oregon Stream Classification System is also described in an appendix to this document.

SFAM Workbook Version 1.1 (Excel Spreadsheet)
This spreadsheet contains a cover page to enter basic information about the assessment, worksheets for entering assessment data collected in the office for calculation “values” scores, field forms for entering assessment data collected in the field that will be used to calculate the “functions” scores, and the subscores and scores sheets.  The data from the field data sheets will auto populate the functions sheet and the scores will be automatically generated by the worksheet.

To collect data in the office for calculating the values scores the SFAM and Oregon Rapid Wetland Assessment Protocol (ORWAP) Map Viewer is used.

Guidance for the use of the SFAM in state permitting programs can be found in the DSL Removal-Fill Guide.

Previous SFAM Versions

Previously distributed versions of the SFAM are provided below.  The purpose is to allow users to apply an identical SFAM version to a site that is being assessed over a period of years.  For new projects and permitting processes the most current version of SFAM should be used.



Melody Rudenko
Mitigation Specialist