User's Guide to Fish Habitat Descriptions that Represent Natural
Contents
1. ssseesssssssisssssresrssssssrsssresesssesns 16 Channel Reach Type cssscccccccssssssssstereseersess 17 Gradient and Confinement sc ssseccceeees 17 Bleva tion cicsisccsjasceitans esasi i iiA 18 Dominant Vegetative Cover ccccseesseesees 18 Drainage Area sccciciissssecssteceisstccsscisesqacescesdese 20 Habitat Type Scales cccsssccssscsstseeteesseeeseeens 20 Mesohabitat Scale ccssccsssesccesessesseeeseseeeees 20 Natural Condition Descriptors ccsescccseeenees 23 Frequency Distributions ccccscssesseneeeeeenes 28 Bank Instability ccssscccssesssreceesseneeesseeeetes 28 Bank Under cut secorir 43 Temperature sariini iiaeiai 43 Width to Depth and Width to Maximum Depth Ratios ccccsccsssssccesecesesenseeesesenenonee 59 Surface INOS sisi nei aera ii rN ii 85 Large Woody Debris ccscsessssessessesseeseenees 99 Pool Frequency ssssccsrscsssssscssessssscerssssstsecseseees 99 Other Natural Condition Descriptors 100 General Assumptions and Limitations 101 Suggested Reading cccssssssscceeeseseessesessaceees 101 References for Text and Appendices cs000 102 Appendices A Photographs of Idaho s Salmon River Basin Anadromous Fish Bearing Streams 107 B Salmon River Basin Geology 00 sue 138 C Natural Condition Data Base cee 142 O48 ao2. D cena User s Guide to Fish Habitat of Agriculture Forest Service Descriptions that Represent Intermountain Natural Conditions in the Research Station General Technical Salmon River Basin idaho Report INT GTR 322 August 1995 C Kerry Overton John D Mcintyre Robyn Armstrong Shari L Whitwell Kelly A Duncan frequency and pool frequency Large woody debris and pool frequency are summarized by stream size classes The statistical summaries for the above habitat attributes can be grouped in different ways to create meaningful comparisons For this document the data were grouped by all stream reaches combined by channel reach types distinguished by gradient and confinement and by dominant geology and channel reach type Relative frequency distributions and cumu lative relative frequency distributions were graphed to display all the statistics of variation for the selected habitat variables grouped as above Statistical sum maries for additional habitat type attributes collected by the R1 R4 Fish and Fish Habitat Standard Inven tory Procedures and for more refined groupings such as by drainage area dominant vegetation class can be generated using the natural condition electronic data base dBaseIV Examples displaying some op tional approaches for stratifying summary statistics are provided The intended uses of this natural condition data base are 1 to assist National Forest fishery biologists and reso
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4. urce managers in determining the current and potential condition of fish habitat for multiscale analysis areas and 2 to describe the desired resource condition for a reach watershed or basin that can be achieved through management objectives Acknowledgments This study was funded by the Forest Service s Inter mountain Region fishery staff and the Intermountain Research Station Rodger Nelson Mike Radko Gwynne Chandler Karen Visnovsky Sherry Wollrab Nikki deMers and Jan Pisano Intermountain Research Station personnel managed the data base and com piled stream information from 1991 to 1994 Data collection and processing were completed by Inter mountain Research Station and National Forest field technicians Also contributing substantially to the development of this reference document were fishery biologists from the Northern Region Intermountain Region Pacific Northwest Region Pacific Northwest Research Station Intermountain Research Station other State and Federal agencies and private re source industries Contents Page Untrod ution cecs eiiieaen dinies tr aet iea aaa 1 Landscape Scales cccsscccesssssecesssseeeecsessnteesesees 5 Scale Descriptors cccccssccssssccssscccssessecsccessneceenes 6 Watershed Scale ccccssseseccesssesecesssneeeeesenees 6 E N RY 5 sc E E 6 Clim ate sii ses fecvivceteadias sets cceestieitees seetiiciate ieee 15 Drainage Area isniicerr piieis 16 Disturbance
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