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<br />NATURAL ENVIRONMENT SURVEY <br /> <br />Survey Date: 9/39/86 <br /> <br />Survey Location: <br />Survey Summary: <br /> <br />1000' uls of Twin Lakes <br />ISO' electroflShed. Sample included: 26 brook tront (2"- 7"), 4 rainbow trout (4"-" ,. <br />7") and 1 cutthroat trout (10"). . . . <br />brook. rainbow and cutthroat trout fIShery. . .. . <br /> <br />Basis for !SF: <br /> <br />FIELD SURVEY <br /> <br />Survey Date: 9/30/86 <br /> <br />Grassline Width (ft): 7.2 <br />PHOTOS: 4 <br /> <br />Method Used: R2X <br />Measured Flow (cfs): 1.63 <br />Survey Location: NE 830 TllS RSOW 6PM <br />Notes: 1000' uls of Twin Lakes <br /> <br />WATER A V AlLABILITY <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 (2115-4/14) 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 />MEAN MONTHLY FLOWS (cfs) <br />OCT NOV DEC IAN FEB MAR APR MAY IUN IUL AUG SEP <br />U ~ M ~ ~ U U u n n << u <br /> <br />I <br /> <br />Boswell Gulch <br />SYNTHETIC HYDROGRAPH <br /> <br /> <br />5 <br /> <br />~ 4 <br />~ <br />~ <br />i 3 <br />~ <br />:I: <br />... <br />Z 2 <br />o <br />::;; <br />z <br />~ 1 <br /> <br /> <br /> <br />----- <br /> <br /> <br />--------- <br /> <br />----- <br /> <br />o <br /> <br />OCT NOV OEC JAN FEB MAR APR MAY JUN JUL AUG SEP OCT <br />MONTH <br /> <br />IbosweD2.Wk41 <br /> <br />- CWCS ISF A MOUNT <br /> <br />