Describes the standard inventory procedures for collecting fish habitat and salmonid fish species data for streams managed by the Northern Region and Intermountain Region of the U.S. Forest Service. Defines the structure, pattern and dimensions of fish habitat; describes species composition, distribution, and relative abundance of salmonid species; and facilitates the calculation of summary statistics for habitat descriptions. Appendices: glossary of fish habitat terms, riparian community types. Extensive references. Illustrated.