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<br />NATURAL ENVIRONMENT SURVEY <br /> <br />9/21/98 - Final RSR <br /> <br />Survey Date: 9/30/86 <br /> <br />Survey Location: <br />. Survey Summary: <br /> <br />Basis for ISF: <br /> <br />1000' u/s of Twin Lakes <br />150' electrofished. Sample included: 26 brook trout (2".7"),4 rainbow trout (4". <br />7~') and 1 cutthroat trout (10"). <br />brook, rainbow and cutthroat trout fishery. <br /> <br />FIELD SURVEY <br /> <br />Survey Date: 9130/86 <br /> <br />Method Used: R2X <br />Measured Flow (cfs): 1.63 <br />Survey Location: NE S30 TIIS R80W 6PM . <br />Notes: 1000' u/s of Twin Lakes <br /> <br />Grassline Width (ft): 7.2 <br />PHOTOS: 4 <br /> <br />WATER AVAILABILITY <br /> <br />Method: <br /> <br />The Boswell Gulch hydrograph was derived as per the USGS WRI Report 85-4086 (Mountain <br />Region), See hydrograph below, The winter instream flow recommendation was reduced to <br />0.35 cfs (2/15-4/14) based on the water availability analysis, As per the Division 2 Engineer, <br />senior water rights do not present a water availability problem within this reach of stream. <br /> <br />OCT NOV DEC <br />1.5 0.9 0.6 <br /> <br />MEAN MONTHLY FLOWS (cfs) <br />JAN FEB MAR APR MAY JUN <br />0.5 0.5 0.4 0.4 1.8 31. <br /> <br />JUL' AUG SEP <br />13. 4.4 2.3 <br /> <br />e <br /> <br />Boswell Gulch <br />SY NTHEl'1C HY DROGRA PH <br /> <br />5 <br /> <br />iii <br />LL 4 <br />S? <br />~ <br />ii 3 <br />~ <br />J: <br />>- <br />t5 2 <br />::; <br />z <br />~ 1 <br /> <br /> <br /> <br />----- <br /> <br /> <br />--------- <br /> <br />---- <br /> <br />o <br /> <br />OCT NOV DEC <br /> <br />JAN <br /> <br />FEB MAR APR MAY <br />MONTH <br /> <br />JUN <br /> <br />JUL <br /> <br />AUG SEP <br /> <br />OCT <br /> <br />e <br /> <br />IbOSW en2,w k41 <br /> <br />_ CWCS ISF AMOUNT <br /> <br />Div 2 Rec Sum Rpt <br />