ISFAPPC03841

• Case Number: 00CW0105
• 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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Cripple Creek and the Cripple CreeklVictor Mining Company. These recommendations are
discussed in detail below.

Instream Flow Recommendation(s)

I BLM's instream flow recommendation is for 13.0 cfs (April 1- October 31) & 4.5 cfs
(November 1- May 31) (see BLM letter in Appendix A).
2 WWW & QR's flow recommendation is for 5.25 cfs (April 1 - July 31) & 3.00 cfs
(August 1- March 31) (see WWW/QRExecutive Summary in Appendix A).

Land Status Review

Total Length Land Ownershio
Upper Terminus Lower Terminus (miles) % Private % Public
Felch Creek Wilson Creek 3.3 40% 60%

This segment is approximately 60% public land and 40% private land. 100% of the public land
is managed by the BLM (See attached Figure 1).

Biological Data

The Colorado Division of Wildlife (CDOW) and BLM have conducted field surveys of the
fishery resources on this stream and have found a natural environment that can be preserved. In
this reach of stream, a coldwater fish species was sampled (brook & brown trout) to indicate the
existence of a natural environment (See CDOW Reports: Fremont and Teller County Aquatic
Community Monitoring 1994 & 1995 and 319 Assessment in Appendix B).

Field Survey Data

WWW,BLM, CDOW and CWCB staff used the R2CROSS methodology to quantify the amount
of water required to preserve the natural environment to a reasonable degree. The R2CROSS
method requires that stream discharge and channel profile data be collected in a riffle stream
habitat -type. Riffles are most easily visualized, as the stream habitat type that would dry up first
should the streamflow cease. This type of hydraulic data collection consists of setting up a
transect, surveying the stream channel geometry and measuring the stream discharge. Appendix
B contains copies of the field data collected in regards to this proposed segment.

Biological Flow Recommendations

The CWCB staff relied upon the biological expertise of the cooperating agencies to interpret the
output from the R2CROSS data collected to develop the initial, biologic instream flow
recommendation. This initial recommendation is designed to address the unique biologic
requirements of each stream without regard to water availability. Three instream flow hydraulic
parameters, average depth, percent wetted perimeter and average velocity are used to develop
biologic instream flow recommendations. The CDOW has determined that by maintaining these
three hydraulic parameters at adequate levels across riffle habitat -types, aquatic habitat in pools
and runs will also be maintained for most life stages of fish and aquatic invertebrates (Nehring
1979; Espegren 1996).

For this segment of stream, four data sets were collected with the results shown in Table 1
below. The four surveys are listed in the order of where they are located on the segment, starting
from the most upstream survey to the most downstream survey. Table 1 shows who collected
the data (Party), the date the data was collected (Date), the measured discharge at the time of the
survey (Q), the accuracy range of predicted flows based on Manning's Equation (240% and 40%