ISFAPPC02207 ‎(2)‎

• Case Number: 00CW0102
• 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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the summer flow recommendation based upon meeting 3 of 3 hydraulic criteria and the winter
flow recommendation based upon 2 of 3 hydraulic criteria.

Table 1: Data
Partv Date Q 250%-40% Summer (3/3) Winter (2/3)
WWW/QR 11117/98 6.99 17.5-2.8 ? 0.5(1)

BLM 4/16/96 10.97 27.4-4.4 7.1 2,5
DOWIWWW 4/15/99 6.19 15.5 - 2,5 10.5 3.8
DOW/WWW 4/15/99 6.91 17,3 - 2.8 7,0 6.0

WWW/QR 11/17/98 7.08 17.7 - 2.8 19,5OT LO(I)
BLM = Bureau of Land Management DOW - Division of Wildlife WWW - WW Wheeler QR _ Queen ofthe River
(I) Predicted flow outside of the accuracy range of Manning's Equation. ? = Criteria never met in R2CROSS StaglDg Table.

Biologic Flow Recommendations
The BLM recommended a 7,0 cfs summer flow and a 2,5 cfs winter flow based on their April
161h, 1996, data collection effort. An alternative flow recommendation, based on additional data
collected by WWW/QR, of 6.0 cfs, May 1 - July 31, 4.0 cfs August 1 - October 31 and 3 cfs,
November 1 - April 30, was proposed by the City of Cripple Creek and Cripple Creek/Victor
Mining Company, The WWW/QR flow recommendations were based on an adjustment of the
CWCB/CDOW 1 ftIsec velocity criteria standard for summer flows down to 0.8 ft/sec (See
WWW/QR Executive Summary). The CWCB tabled action on this flow recommendation until
CWCB staff could review the additional data collected by WWW/QR and to collect additional
data, if necessary,

Staff reviewed the data collected by the BLM and WWW/QR and decided to collect two more
additional data sets, bringing the total number of data sets for review to five. The summer flow
recommendations, which met 3 of 3 criteria and are within the accuracy range of the R2CROSS
model fall somewhere between 10.5 and 7.0 cfs (See Table 1). Averaging the three summer flow
recommendations gives a summer recommendation of 8.2 cfs. The winter flow
recommendations which met 2 of 3 criteria and are within the accuracy range of the R2CROSS
model fall somewhere between 6.0 and 2.5 cfs (See Table 1). Averaging the three winter flow
recommendations gives a summer recommendation of 4.1 cfs,

Hydrologic Data

After receiving the cooperating agencies' biologic recommendation, the CWCB staff conducted
an evaluation of the stream hydrology to determine if water was physically available for an
instream flow appropriation. The hydro graph was derived from data collected by the USGS
stream gage for Fourmile Creek below Cripple Creek (ID #07096250), which has a drainage area
of 272 square miles (see Gage Summary in Appendix C), The period of record for this gage is
1992 to present, the period of record used by staff in their analysis was 1992 - 1997, or five years
of record, The estimated drainage area of Fourmile Creek upstream and including High Creek is
246 square miles and the drainage area upstream of Cripple Creek is approximately 257 square
miles, Tables 2 and 3 below display the estimated flow of Fourmile Creek at the confluence with
High and Cripple Creeks, in terms of a percentage of exceedence. The orange shading highlights
how often the summer flow has been available and the blue shading highlights how often the
winter flow has been available.

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