Table 22. Summary of electrof ishing survey for a 1,000 foot section of 

 Slaughterhouse Creek (T3N, R12W, Sec 34C) on August 13 and 

 August 21, 1980. 



Species No. Captured Length Range (inches) 



Brook Trout 173 2.3 - 10.3 



Rainbow Trout 1 6.8 



Mottled Sculpin 

 Longnose Sucker 



The standing crop of brook trout in the study section was estimated 

 using a mark-recapture method (Table 23). The section supported approximately 

 182 fish representing a biomass of 19 pounds. Catchable fish (6 inches and 

 longer) amounted to 42 percent of the papulation. Brook trout condition 

 (length to weight ratio) was good and slightly above average for Mount Haggin 

 streams and other upper Big Hole River tributaries (MDFWP, unpublished data). 

 Data from the study section indicate that Slaughterhouse Creek has a good 

 fishery relative to the size of the stream. 



Table 23. Estimated standing crop of Brook trout in a 1,000 foot section of 

 Slaughterhouse Creek (T3N, R12W, Sec 34C) on August 13, 1980. 

 Eighty percent confidence intervals are in parentheses. 



Per 1,000 ft. 



Species Length Group (inches) Number Pounds 



Brook Trout 3.5 - 6.9 130 



7.0 - 10.3 _52 



182(+28) 19(+2) 



4. FLOW RECOMMENDATIONS 



Cross sectional data were collected in a 165 foot riffle-run sequence 

 located approximately at stream mile .2 (T3N, R12W, Sec 34C). Five cross 

 sections were placed within this sequence. The WETP program was calibrated 

 to field data collected at flows of 8.7, 5.0 and 1.8 cfs. 



The relationship between wetted perimeter and discharge for a composite 

 of three riffle cross sections is shown in Figure 9. Lower and upper inflection 

 points occur at 2 and 4.5 cfs. Based on an evaluation of the existing fishery 

 and recreational use potential, a flow of 3 cfs is recommended for the low flow 

 period (July 1 - April 30). Due to a lack of long term flow data, recommendations 

 for the high flow period (May 1 - June 30) cannot be derived for Slaughterhouse 

 Creek. 



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