ISFAPPC03327

• Case Number: 00CW0103
• Stream Name: Fourmile Creek
• Watershed: Fourmile Creek
• Water Division: 2
• Water District: 12
• County: Fremont
• Instream Flow App - Doc Type: Supplemental Data

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EXf'cedenres Ian Jarv FehrUllrv Marf'h Annl Mov Tlln'" r"lv .;.,m,,' v~ , N"'vprnh..r n......pmh....
10/, 21.4') 1\.\0 13.'1 65.50 344.40 17" M 99.90 74.70 47.10 79.35 79.\0 "1.90
I,,^ 1".1)() 14.00 'I.M WOO 195.30 153.00 86.00 46.00 35.00 29.1)() 26.50 19.00
100/, 15.00 11.90 10.M 47.00 ]56.00 124.00 79.50 39.50 27.00 27.00 18.00 17.00
20% 11.00 8.70 950 25.00 114.00 97.00 46.00 31.00 "4.00 21.00 17.00 11.00
50% 650 6.00 7.95 15.00 31.50 48.00 17.00 15,00 14.00 15.00 8.60 6.50
80% 5.10 4.10 5.80 9.80 14.00 16.00 12.00 1000 9.10 9.10 7.30 5.50
900/- 4.50 3.90 4.90 ".90 90\ 9.30 975 4" S.OO 6.75 6.60 1.10
.,0/, 4 nn 370 4."7 8.25 6."3 7.'0 7/'-\ 4.10 4.sn '47 "no 4.]0
990/, ),SO :170 4.26 6.90 5.16 7.10 S,6S 2.Rl 4,lS 4.10 5.\0 378

,.. Table 3: Estimated Fourmile Creek flow upstream of Trail Gulch
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Excecdences .Januarv Februarv March Anri! Mav June Jul' AUlmsl SeDtember October November December
1% 26.25 18.39 16.15 68.30 347.?0 180.80 102.70 77.50 50.30 82.15 82.30 25.70
5o/c "'0,80 16.80 13.80 62.80 198.10 155.80 88.80 48.80 37.80 31.80 "9.30 21.80
10% 17.80 14.70 12.80 49.80 158.80 i26.80 82.30 42.30 29.80 29.80 20.80 19.80
20% 13.80 11.50 12.30 27.80 [ 16.80 99.80 48.80 33.80 26.80 23.80 19.80 13.80
50% 9.30 8.80 10.75 17.80 34.30 50.80 19.80 17.80 16.80 17.80 11.40 9.30
RO% 7.90 6,90 860 12.60 16.80 18.80 14.80 12.80 11.90 11.90 10.10 8.30
90% 7.:W 6.70 7.70 ] 1.70 11.85 ]2.10 12.55 765 7.80 9.55 9.40 7.90
95% 6.80 6.50 7.47 11.05 9.43 ]0.60 10.45 6.90 7.10 8.27 '.'" 7.<0
99% 6.30 6.00 7.06 9.70 8,06 9.90 8.45 5,61 6.95 7.06 8.30 658

Tables 2 and 3 show that the winter recommendation of 4.5 cfs (October 15th - April 14'h) is
available at least 50% of the time throughout the entire reach and 99% of the time at the lower
end of the reach. Tables 2 and 3 also show that the summer flow recommendation of 9.4 cfs
(April 15th - October 14th) is available at least 50% of the time throughout the entire reach and
80% of the time at the lower end of the reach.

Precipitation Data

Staff reviewed local precipitation data sets from 4 different sites located around the Fourmile
Creek Drainage (see Precipitation Data in Appendix C). These sites include Guffy (1951- I 997),
Canon City (1931~1997), Lake George (1948-97) and Ruxton Park. (1959~1997) (See Figure 3).
Table 4 shows the water year and the percent of average precipitation recorded at each site.

T bl 4 P

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a e reclpltatlDn ata as a percenta e 0 Average.
Water Year Guffy Canon City Lake George Ruxton Park
1992~93 86% 94% 70% 88%
I 993~94 148% No Data 100% 129%
1994~95 139% No Data 114% 133%
1995~96 108% 115% 74% 95%
1996-97 103% 165% 74% 169%

Table 4 shows the wide vanatlon of precipitation between four relatively close precIpItation
sites, the 1992-93 water-year was below average at all four sites, the 1994~95 water-year was
above average for three sites and the 1995~96 water~year was above average for two sites and
below average for two sites. It is staffs opinion that the five years of stream-flow data analyzed
is representative of average to slightly above average water~years. However, because the
requested flow amounts were exceeded at least 80% of the time, no adjustment to the
recommended in stream flow amounts was made. Figure 4 below shows the Fourmile Creek
stream flow for the 1992~ 1997 time period.