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<br />Lake Fork ~cWCD - f~~I....J,~ l> c. , fI'vJr'
<br />QP at sec 9 - 9S - 81W; 100 yards below Glacier Creek confluence ('",js./.,,,Jd.. /'efD",~.'!L. t r.J('
<br />Amount: The existing CWCB base flow of 7,0 cfs year round is acceptable and needed l?
<br />for fish purposes at the QP, In addition, the USFS requests a h;nh f1f'wfor 20 days \ Lj It F
<br />between May I and July 15 of at least 70% of bankfull and up to 120 % of bankfull
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<br />(quantified as 132.0 cfs to 227,0 cfs) to maintain functions and habitat for greenback __
<br />cutthroat trout, which are uresent in the stream according to the CDOW, The"ilioup
<br />wanted this definition (limits) of the high flow request and assurance that there would be
<br />some upstream exchange potential particularly during runoff.
<br />
<br />A.. on Lake Fork Creek for the period 1946 - 1967 (drainage area of23,9 square
<br />miles; elevation at 9,800 feet) suggests the existing CWCB year-round instream flow of
<br />7,0 cfs is met 50% of the year, Flows during the winter are typically in the 1,5 to 6,0 cfs
<br />range and average around 4.0 cfs, The low portion of the USFS high flow range (132,0
<br />cfs) is met 20% ofthe time in May, 80% of the time in June and 10% of the time in July,
<br />The high portion of the USFS high flow range (227,0 cfs) is met 10% ofthe time in
<br />May, 50% of the time in June and 5%'ofthe time in July,
<br />"ff4r{J'/c......,.O'$wr.O - CI>,,'dGI.~ ~("(.e.." B)
<br />HalfmoonCreek.5&:'lVC,D - .I""~ N....,.....I'I"':..c. oft"".,.
<br />QP at sec 13 - 10S - 81W; 100 feet upstream of east section line (forest boundary)
<br />Amount: The existing CWCB base flow of 7 ,0 cfs year round is acceptable and needed
<br />for fish purposes at the QP, In addition, the USFS requests a hiW :Q,nw for 20 days
<br />between May I and July 15 of at least 70% of bankfull and up to 120 % of bankfull
<br />(quantified as 158,0 cfs to 271.0 cfs) to maintain habitat for greenback cutthroat trout.
<br />The Group wanted this definition (limits) of the high flow request and assurance that
<br />there would be some upstream exchange potential particularly during runoff, TheUSFS
<br />also asked that appropriating all remaining flows be considered as this watershed is one
<br />of only 53 USGS hydrologic benchmark watersheds nationwide, and one of two in
<br />Colorado, Benchmark watersheds are monitored continuously to provide consistent data
<br />on hydrology, water quality and related factors in representative undeveloped areas for
<br />comparison and contrast to conditions in basins affected by the activities of man,
<br />
<br />The ..on Halfmoon Creek (period of record 1946 - 1995; drainage area of23.6
<br />square miles; elevation at 9,830 feet) indicates that the year-round existing CWCB
<br />instream flow of 7,0 cfs is met 50% of the time, Flows during the winter are typically in
<br />the 1,5 cfs to 7,0 cfs range and average around 4,0 cfs. The low portion of the USFS high
<br />flow range (158 cfs) is met 1% of the time in May, 20% of the time in June and 10% of
<br />the time in July, Overall, a flow greater than 150 cfs is only present 3.5% of the time,
<br />The high portion of the USFS high flow range (271 cfs) is met 0% of the time in May,
<br />1% of the time in June and 1% of the time in July, A mean daily flow of 157 cfs
<br />occurred for 15 consecutive days in 17 ofthe 29 years between 1947 and 1975 and a
<br />mean daily flow of 156 cfs occurred for 30 consecutive days in II of those 29 years,
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