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:;!' ,~ "" Complete documentation of literature search is found in the Appendix of this report (see "Record of Literature Search"). I As a result of this literature search several hydrologic analyses were found covering the study streams. _ Several analyses conducted by the Bureau of Reclamation in 1967 (refer to appendix of this report) as part of their work on the Arkansas-Fryingpan Project included frequency studies of Lake Creek and the Arkansas River in or near the study area. Due to l~ years of additional gage records, the frequency analyses were recalculated for this report. In addition the U.S. Forest Service has operated a precipitation - runo ff network within the Lake Creek bas in from 1965 - 1977. This network included monotoring of precipitation and runoff flows at five locations in the upper Lake Creek Basin with stream gages on the North and South Forks, Lake Creek, and Sayres Gulch. Since this information has never been published, covers a relatively short period of record and covers only the upper areas of the watershed much farther upstream of the study site, it was not useful in this study. Refer to the Appendix of this report for information supplied by the Forest Service. A map showing the gage locations is included in the Appendix of this report. DRAINAGE BASIN CHARACTERISTICS Lake Creek Lake Creek originates in Everett, Colorado, at the confluence of the North and South Forks of Lake Creek. The headwaters are located in San Isabel National Forest at elevations in excess of 13,500 feet. Lake Creek flows from its origin 7.5 miles to Twin Lakes Reservoir and then to its confluence with the Arkansas River at Balltown, Colorado. The drainage basin is shown on Figure 2. Lake Creek being part of the Arkansas-Fryingpan Project (see description in Appendix) includes a major flow diversion into the watershed from the Colorado River Basin through the Twin Lakes Reservoir and Canal Company Tunnel Number 1. This ~iversion is located in the headwater areas of Lake Creek approximately 4.5 miles upstream of the study site. A USGS/State of Colorado streamgage (07084500) on Lake Creek upstream of Twin Lakes Reservoir and located approximately 3.0 miles downstream of the study site has been operational since 1941. Tunnel flows have been monitored by the State of Colorado since 1935. In addition, a snowfence monitoring study conducted by the U.S. Forrest Service (Refer to previous section) was conducted from 1965 1977 . ()k, ~(/t .jpf ~ -W cJL -htf.?(yP - /4 & .knn ~~ ~d? ;P~.71W!~/~ ~<:~~ JtVM?~-h&. o